Thursday, April 1, 2021

Leonardo da Vinci : "The Renaissance Man"


Hello and Welcome again to my new  Article, "The Renaissance Man", Leonardo da Vinci was a genius who invented revolutionary ideas centuries before his, the rest of the world would catch up with him. He embodies the definition of a “Renaissance Man”- one who studied and mastered a variety of different subjects. He was a Painter, Engineer, Architect, Writer, Scientist, and Inventor.

While you may know him for his most famous works of art like The Mona Lisa or The Last Supper, few people know the man behind the paintings.

 Mona Lisa

Sometimes known as La Gioconda or La Joconde, the Mona Lisa is a half-length portrait of a woman by famous Italian artist Leonardo da Vinci. According to art experts, the Mona Lisa is the best known, most visited, and overall most famous work of art in the entire world. Mona Lisa, a masterpiece, was a real person. And we're not talking about a self-portrait of the artist, as you may think. Mona Lisa was a real Florentine woman, born and raised in Florence under the name of Lisa Gherardini.



The Last Supper is a late 15th-century mural painting by Italian artist Leonardo da Vinci housed by the refectory of the Convent of Santa Maria delle Grazie in Milan, Italy. It is one of the Western world's most recognizable paintings, One reason it's so famous is because its survival is something of a miracle," King said. "It's the art world's most famous endangered species. A century ago it was almost given up for lost. After its most recent restoration — something of a miracle in itself — we can appreciate its beauty. Leonardo da Vinci probably between 1495 and 1498 for the Dominican monastery Santa Maria delle Grazie in Milan.

Today on Biographics, we’re talking about Leonardo da Vinci.

Early Life: A baby boy named Leonardo was born on April 15th, 1452 in a Tuscan village called Vinci. The child was born out of wedlock (unmarried parents), to a wealthy legal notary named Messer Piero Fruosino di Antonio, and a beautiful peasant girl named Caterina di Meo Lippi. His father took responsibility for the boy, and raised him on the family estate with his wife. But as a bastard child, young Leonardo was not even allowed to be given his father’s last name.....



(Ser Piero d'Antonio di ser Piero di ser Guido da Vinci ( 1426 - 9 July 1504 ) was the father of Leonardo da Vinci , as well as a notary and a man of Florentine culture. )

i.

(The identity of Leonardo's mother has until now been shrouded in mystery. But a forthcoming book by Professor Martin Kemp, Emeritus Professor of the History of Art at Trinity College and Oxford University, has identified her as 15 year old orphan Caterina di Meo Lippi, who gave birth to Leonardo on 15 April 1452.Oxford University art historian Martin Kemp says Leonardo da Vinci's mother was a poor peasant. ... Researchers have claimed that his mother, Caterina, gave birth to an illegitimate son from a relationship with a lawyer when she was 15 years old. The speculation in recent years is that she was a slave.)

He was simply called “Leonardo da Vinci” which means “Leonardo, of Vinci.” Leonardo lived with his biological mother until he was 5, and his father took over the responsibility of raising him. Caterina went on to marry a man who was simply referred to as “the fighter”. Leonardo’s father, Messer, married a 16-year old noble girl named Albiera, and they had legitimate children of their own. 

Instead of going to school, the countryside was young Leonardo’s classroom. Even at a young age, he was an inquisitive, and truly fell in love with nature. He wished that men could fly like birds, and swim through the ocean like fish. Together with his brothers, they played games of war, and he imagined being triumphant in battle, like the men in the stories told by his father.

However, this stage of innocence could not last forever. As he grew up, Leonardo learned that he would not be allowed to inherit the family estate. Leonardo had 9 brothers and 3 sisters. So, even if he could inherit his father’s estate, it’s not like there would be much  left to go around, anyway. He had to learn a trade and figure out how to take care of himself. 

In Medieval Florence,guilds (a medieval association of craftsmen or merchants, often having considerable power) were like trade unions, and they were split up into multiple categories of jobs that a man could choose from, so long as he was born into the right social class. The highest ranking guilds were called the “Arti Maggiori”, and his father would have been apart of the guild of powerful lawyers, judges, and notaries.

But as an illegitimate child, this was like being in the lower class, and he was not even allowed to join the lesser guild categories like “Arti Mediane” , which had the middle class skills like blacksmiths and stone masons.

His only option would be to join a guild in the “Arti Minori”, which had lower-class jobs like bakers and millers. However, Leonardo’s father still wanted his son to have a good life. He could see that the boy had a natural talent for art. So, his father introduced him to a man named Andre del Verrocchiowho ran an art studio in the city of Florence. After seeing the boy’s sketches, he agreed to take him on as an apprentice. 

The Florence Guild of Artists Andre del Verrocchio had several artists and craftsmen working for him in his workshop.

He would take on commissions from the wealthy and powerful Medici family, and divide the work among his students and employees. Their studio worked on improving the beauty of the city. They had to work with all mediums, whether it was carving marble statues, casting metal, or painting portraits. Even architecture, bridges, and other forms of civil engineering were all sketched by the members of the guild.

So it became necessary for Leonardo to learn multiple disciplines. After a few years of training, Leonardo da Vinci assisted Verrocchio in painting a commissioned piece for the Catholic Church called “The Baptism of Christ”.

This was a very large mural on the wall of a church, so there was plenty of space for two artists to stand and work on the painting at the same time.

Verrocchio instructed Leonardo to paint two angels that had been included in his rough sketch. When Da Vinci was done, Verrocchio was in shock. He could not believe how gorgeous and life-like the painting was.

Approach to Scientific Investigation and Experiments:

Verrocchio knew that the student had already surpassed the master. By his mid-20’s, Leonardo Da Vinci became a master artist in Verrocchio’s studio, and he earned a reputation for himself in Florence. Leonardo conducted experiments with his art, like studying how light changed the shading on an object, or the perfect time of day to sketch someone’s face.

Leonardo wrote:

(The lights which may illuminate opaque bodies are of 4 kinds. These are; diffused light as that of the atmosphere; And Direct, as that of the sun; The third is Reflected light; and there is a 4th which is that which passes through [translucent] bodies, as linen or paper etc.)

However, his talent was also a curse, because it caused a lot of jealousy among the art community.

At 24 years old, Da Vinci was accused of having sex with a male prostitute, and he was arrested for sodomyAt that time, the punishment for sodomy was being burned to death. But when he went to trial, no evidence or witnesses were presented, and they could not prove that he did anything illegal. So they let him go. However, even though he was found “not guilty”, he wrote in his journals that this scandal very seriously hurt his reputation. Fewer clients wanted to work with him around Florence, despite his obvious talent.

We don’t know his actual sexual orientation, except that he never got married. Some believe that he chose to be celibate in order to focus more on his work. At the end of the day, whoever turned him into the authorities wanted him dead. As awful as this sounds, medieval times were truly cut-throat, and men of high standing always had to watch their backs to make sure they were not killed by their enemies.

An assassin named Bernardo di Bandino Baroncelli stabbed Giuliano de’ Medici in the streets simply because they were both from rival banking families.

One of Leonardo’s earliest known sketches was his observation of Baroncelli’s body in the gallows called “The hanged man”. After this dispute between the Baroncellis and the Medici families, Florence and Naples were on the brink of war. (Study of the hanged bernardo di bandino baroncelli assassin of giuliano de medici - by Leonardo da Vinci)

The men in Da Vinci’s guild were forced to stop working on art, and use their Engineering skills to defend the city, instead.

Since Da Vinci was a bastard, he could not become a knight and serve in a royal court, so he thought this was far more exciting than painting Catholic murals. He started to design ladders and massive weapons to help defend Florence, should they ever need it. Perhaps he saw this as his way to be remembered in the history books.

A Renaissance Arms War!:

The Tank. (Da Vinci's design for an armoured vehicle made from wood and operated by eight men was made in 1487. The 'tank' was operated by turning the cranks,The concept was designed while Leonardo da Vinci was under the patronage of Ludovico Sforza in 1487. Sometimes described as a prototype of modern tanks, Leonardo's armored vehicle represented a conical cover inspired by a turtle's shell.) 


The Machine Gun: (Leonardo's machine gun, which was designed to fire crossbow bolts, highlights his fascination in the production of rapid-fire weaponry.Leonardo da Vinci's Machine Gun was the first auto-firing weapon ever invented. He designed it in such a way that when it was first fired another set of barrels would rotate around and e ready to fire almost immediately.)


Three Racks of Barrels: (The three racks of barrels Allowed the re-loading of one rack while another was being fired and could maintain continuous firepower. The 'fan type' gun with its array of horizontal barrels allowed for a wide scattering of shot. These breech loading, water-cooled guns were years ahead of their time and it's interesting to note that steam cannons were used in World War II.)


Mortars: (The design for mortars with exploding shells was intended to gain an advantage over the enemy by producing large amounts of small fast-moving shot which would cause maximum casualties. the designs for mortars that improved upon the current military technology.  Cannons of the day shot large, solid spheres. To increase the efficiency of the mortar, da Vinci designed projectiles that contained mini gunpowder shots. The shots were packed into petal-shaped iron pieces that formed a ball. The cannonball was loaded into the mortar and fired.)

  

Crossbows and Catapults:(Leonardo designed a huge crossbow,(his ballista), and it was truly huge (86 feet long). The weapon boasted a worm and gear mechanism to draw the bowstring and was mounted on canted wheels providing a stable base on the rough ground.Two alternate firing mechanisms allowed the bow to release by a hammer blow or by lever action.The catapults and repeating large crossbows were intended as cheaper alternatives to more expensive firearms. Leonardo came to realise that these catapult designs were being overtaken by the more efficient guns and cannon.)           

Tread Wheel Machine Gun (He also made drawings for a repeating 'machine gun’ operated by a man-powered treadmill. Treading on the outside of the wheel instead of the inside gave greater leverage to the operator. Additionally, its lightweight and large wheels would have provided for excellent mobility on the battlefield. The aim of the tiers is that in rotation, the first tier is fired.)

Flying Machines: Da Vinci’s fascination with the mechanics of flight did not only extend to his many studies of birds, their wings and propulsion, he also realised the importance that manned flight could have on warfare. His many concept studies for flying machines are a testament to his inquiring mind and he produced designs that were years ahead of their time. Imagining bombs and arrows raining down on enemy positions were notions that only became a reality centuries later in the first and second world wars of the twentieth century. Leonardo had also considered the possibility of an enemy using flying machines in battles, and designed weapons that would shoot them down!.

(Most of Da Vinci's Aeronautical designs were Ornithopters, machines that employed flapping wings to generate both lift and propulsion. He sketched such flying machines with the pilot prone, standing vertically, using arms, using legs. He drew detailed sketches of flapping wing mechanisms and means for actuating them. Da Vinci seemed truly excited by the possibility of people soaring through the skies like birds. One of da Vinci's most famous inventions, the flying machine (also known as the "Ornithopter") ideally displays his powers of observation and imagination, as well as his enthusiasm for the potential of flight.)

Leonardo da Vinci, (One scientist and engineer at the time was fascinated by nature and blessed with a problem-solving mind able to combine the disciplines of art and science. He looked at flight from a different perspective and understood that it must be able to be described by mathematics. That, if understood correctly, could then be applied to make people fly. That scientist and engineer was he.) ..Amazing 


During a three months time period, the city was on edge, believing they were on the brink of war. When Lorenzo Medici returned after making a successful peace treaty, the rest of the city celebrated, and Leonardo was actually disappointed. After peace was returned to the city, the artist’s guild could go back to making beautiful things, but this was no longer challenging or interesting to Leonardo Da Vinci.

(Lorenzo di Piero de' Medici was an Italian statesman, banker, de facto ruler of the Florentine Republic and the most powerful and enthusiastic patron of Renaissance culture in Italy)


When (Leonardo da Vinci) 29 years old, he was asked to do his first commissioned mural at a church all by himself. The painting was called “Adoration of the Magi”, and he took his concept above and beyond what any other painter had done in the past. It was an incredible piece, but Da Vinci didn’t seem to see that, because after spending a very long time working on the piece, he decided that he could not finish the painting.

He was very restless at that time, and didn’t have the patience to actually sit and complete a lot of his projects.

He had so many brilliant ideas, he sometimes had trouble executing them. Da Vinci was actually sued more than once for getting paid by a patron, and then failing to finish his work, as promised. With this, coupled with the accusation of sodomy, his talent was not enough to make up for his bad reputation.

He thought that maybe, it was time to start over somewhere new. A New Life in Milan Even though he was more talented than many of the other painters in Florence, Leonardo Da Vinci still went through a midlife crisis when he was 30 years old. He realized that the lifestyle of a professional artist did not suit him, and he craved the adventure of having a career in weapon designs.

He had an entire book filled with incredible inventions that would not be made until years later, like a tank, a giant crossbow, underwater scuba gear, and even a robotic soldier.

He was truly hundreds of years ahead of his time, but without a war, these weapons would never actually come to life. Leonardo da Vinci planned to move to Milan, because it is the most northern Italian state, but he wanted to secure employment before he made the journey. Since the city is much closer to France, they were far more interested in gathering weapons to defend the country.


He sent a letter to the Duke of Milan, claiming that he was a weapon’s design expert, and included a few pages from his sketchbook. At the very end of the letter, he included a single line mentioning that he was also a painter.

Ludovico Sforza was the temporary Duke of Milan, holding the position of power until his nephew came of age. (Ludovico Maria Sforza, also known as Ludovico il Moro, was an Italian Renaissance nobleman who ruled as Duke of Milan from 1494, following the death of his nephew Gian Galeazzo Sforza, until 1499. A member of the Sforza family, he was the fourth son of Francesco I Sforza.)

The Sforza family had not been in power for very long, especially compared to the likes of the Medicis. Sforza invited Leonardo da Vinci to visit, and he was overjoyed, hoping that he would finally be able to make a career change.

But, once he got there, he was gravely disappointed to find out that the Duke wanted him to paint a portrait of his beautiful mistress. Today, that portrait is called “Lady with an Ermine”

(The Lady with an Ermine is a portrait painting widely attributed to Italian Renaissance artist Leonardo da Vinci. Dated to c. 1489–1491 the work is painted in oils on walnut panel.)

Even though he came to Milan to escape being a painter, he still blew people away with his talent. Sforza was so impressed, he commissioned a statue of a 24-foot tall horse. Da Vinci told him that it would take at least 3 years to complete. In reality, Da Vinci was stalling for time, because without the help of his master’s studio, he had no idea how he was going to pull off a 24-foot tall metal cast horseRemember- this was back in the 1400’s, so there was no benefit of modern machinery to help himThe Sforzas were still establishing themselves, and the Duke of Milan believed that paying for things like metal statues would somehow prove their permanence in high society.

At first, Da Vinci created the horse out of clay, and it was  unveiled at a party, where Da Vinci was officially accepted into the Sforza royal court. Unfortunately, just like a lot of his projects, DaVinci was a bit in over is head, and he was running out of time.

By a stroke of luck, Sforza decided to go to war, and he needed the metal resources for his army’s weapons.

Yet again, Da Vinci thought this might be his time to shine with his weapon designs, but there weren’t enough resources to pay for their creation.

The Duke of Milan gave him a new assignment of decorating a church called Santa Maria delle Grazie, which is where he painted one of his most famous works, “The Last Supper.

At the time, the priests were actually very annoyed with him, because it took him over 3 years to complete the painting, which is a mural on the wall of the church.

For 17 years, Da Vinci enjoyed a life of financial security and respect in Sforza’s royal court. During the time that he lived in Milan, Da Vinci had a secret project that he never dared to tell anyone, and it is likely a good reason why the rest of his work was taking so long.

Approach to Human Anatomy:

From observing the static structure of the body, Leonardo proceeded to study the role of individual parts of the body in mechanical activity. This led him finally to the study of the internal organs; among them he probed most deeply into the brain, heart, and lungs as the “motors” of the senses and of life. He was dissecting human cadavers and sketching their bodies, muscles, and organs. He also made wax casts of the organs. Yes, this sounds incredibly creepy, and he realized this, which is why he kept his sketchbook a secret, and it only showed up in the 1600’s.

At that time, autopsies (a post-mortem examination to discover the cause of death) and any other form of disturbing the dead was frowned upon by the Catholic Church. He already knew what it was like to have a soiled reputation back in Florence, so he was far more careful this time while leading a double life.

Even though his sketchbook was found over 100 years later, his studies of the human body were revolutionary, and became the foundation of modern anatomy.

Leonardo da Vinci would write in notebooks about his scientific experiments, inventions, and artistic ideas. There are over 15,000 pages of his notes that survived.

He even wrote some of those notes backwards, so you can only read them when looking in a mirror. Some people believe he did this because he was worried that his rivals would steal his ideas.

Home coming When Leonardo Da Vinci was 50 years old, the Sforza family lost their position of power, and the French invaded Milan. When they saw the giant clay horse statue standing on the estate, they used it for target practice.

Leonardo da Vinci had to leave Milan with the bare necessities, like his journals, and left all of his works of art behind. He decided to travel from place to place, once again trying to pitch his ideas for military weaponry around Italy. 

He showed The Duke of Venice hisideas, which included a Snorkeling Suit for breathing underwater that actually worked. He had ideas on how humans could fly, or walk on the bottom of the ocean. Keep in mind, this was at a time when people didn’t even have clocks or watches to tell time.

(Da Vinci's design for an underwater breathing apparatus consists of cane tubes joined by leather, with steel rings to prevent them being crushed by the water pressure. ... A diving suit based on this design using pig leather, bamboo tubes, and a cork float was built, and tested by a diver, Jacquie Cozens.)

While all of his ideas were amazing, they were far too ahead of his time, and the Duke of Venice didn’t find a need for any of those inventions.

Da Vinci was forced to reluctantly move back to Florence, because he feared that everyone would still remember his bad reputation.

But it was actually far worse than that, because by that time, people had all but forgotten the name Leonardo Da Vinci, and there was a new genius in town: Michelangelo di Lodovico Buonarroti Simoni. But you know as simply “Michelangelo”. He was just 26 at that time. Since the art world in Florence was so competitive, Leonardo hated Michelangelo almost immediately, because this meant that he would struggle finding work. 
(Michelangelo di Lodovico Buonarroti Simoni, known simply as Michelangelo, was an Italian sculptor, painter, architect and poet of the High Renaissance born in the Republic of Florence, who exerted an unparalleled influence on the development of Western art.)

Da Vinci was clearly jealous, and had to find reasons to dislike Michelangelo. He would write angrily in his journal about how he thought the young man was dirty and undignified. 

Despite the long beard you see in most depictions of Da Vinci, he actually spent all of his younger years making sure he was always clean-shaven, and wore the finest clothes. He even had professional musicians playing music for his clients while they sat for their portraits, and the whole process felt like going to a luxury spa.

Michelangelo, on the other hand, had the polar opposite approach to his art. He was so focused on his work, that he would forget to shave for a few days, and let his beard grow. He let chips of stone and dust cover his home after working on a statue, and it was far more like a workshop than a comfortable place to clients to stay.

The two artists deeply disliked each other, and even got into a fight out in public. Secretly, Da Vinci would go home to write about how depressed he was to be getting older, and the fear and anxiety rules his thoughts.

Be Careful What You Wish For Since Da Vinci could no longer secure his place in the Florence art scene, he decided to try his luck at weapon design one last time. 

Pope Alexander had a bastard son named Cesare Borgia. Some people say that he was a great leader, while others say that Borgia was a bloodthirsty ruler who killed anyone who got in his way.

(Pope Alexander VI, was pope from 11 August 1492 until his death in 1503. Born into the prominent Borgia family in Xàtiva in the Crown of Aragon, Rodrigo studied law at the University of Bologna.)

Machiavelli's famous book called "The Prince" was even based on Borgia as an example of what a ruler must be in order to stay in power.

Da Vinci sent his sketches to Borgia, and finally, someone said yes to the weapons. He become Chief General Engineer for Cesare Borgia, and supervised the construction of towers, weapons, and bird’s-eye-view maps of the cities he planned on invading, which was revolutionary for the time.

(Cesare Borgia was an Italian politician and condottiero whose fight for power was a major inspiration for The Prince by Machiavelli. He was an illegitimate son of Pope Alexander VI and member of the Spanish-Aragonese House of Borgia.)


Da Vinci got everything he wanted?, but it was at a price he never expected. The only reason why Borgia was willing to pay for the creation of all of these weapons was because he wanted to kill as many enemies as possible. Until this point, the idea of war had been simply a concept to Leonard Da Vinci, and stories of knights going to battle seemed like good fun.

For the first time in his life, Da Vinci actually witnessed what a bloody battle looked like, and it was too gruesome for him to handle. He wrote, “Truly, man is more savage than beast, for our brutality exceeds theirs. We live by the death of others.”

The straw that broke the camel’s back was when Borgia ordered the death of one of Da Vinci’s close friends. He quietly left Borgia in the dead of night and moved back to Florence, where he returned to a peaceful life of painting portraits.

Mona Lisa’s Smile After selling those weapons, Leonardo da Vinci had saved a nice nest egg for retirement, and It was during this time that he painted “The Mona Lisa” No one knows for sure who she actually is. There are several theories of who she is, or what she might represent, but none have been confirmed. 

Unlike all of those portraits that were commissioned and given away, he carried around the portrait of Mona Lisa with him for the rest of his life.

For once, this was a piece of art that was done just for himself, but he was constantly changing it, because he never felt he got it exactly right.

During his retirement, he started to build massive wings for human beings, in hopes that it would help people fly. “There will be wings for man. If it is not accomplished by me, it will be accomplished some day, by some other.”

There is a commonly told story that during a flight attempt with these wings, someone fell and broke their leg.

After this failed attempt, he designed a motor that would flap the wings, but it never worked properly. However, he did eventually design the first wing that looks very much like what we use in modern-day airplanes.

Aside from the patrons that he served, Leonardo da Vinci was not yet famous around the world. He intended to publish books, but he never actually went through with it. As we mentioned earlier, he wrote and sketched over 15,000 pages on a variety of subjects, but he was a perfectionist.

So he continued to add on more and more information, because he never felt that they were complete. Among these notes, there are multiple sketches of an old man with a beard. People assume that this was his self-portrait, but no one knows for sure. However, this image is used to portray him in popular culture, and it’s how he is remembered today.

King Francis I in France had been collecting Da Vinci’s pieces for years, and he wrote a letter to invite him to live in his chateau. He agreed to move to France, and when he was 65 years old, and he had a stroke, which paralyzed his arm.

(Francis I was King of France from 1515 until his death in 1547. He was the son of Charles, Count of Angoulême, and Louise of Savoy. He succeeded his first cousin once removed Louis XII, who died without a son.)

The king’s castle became his comfortable retirement, and he was given the best medical care money could buy.


When he died in the year 1519, he left the Mona Lisa and all of his  sketchbooks and journals to his loyal apprentice.

Born a bastard, Leonardo Da Vinci died like a king. His life lives on forever in his work, and he continued to serve as an inspiration to people around the world for centuries to come.

Conclusion

Leonardo da Vinci may well have been the greatest inventor during the Renaissance; however he had very little effect on the technology of his time. Da Vinci drew sketches and diagrams of his inventions, which he preserved in his notebooks, but he either neglected building them or was unable to convince his wealthy patrons to finance construction of the designs – although many of them could not have been built with the technology of the day. As a result, almost none of da Vinci's inventions were built during his lifetime; and because he never published his diagrams, little was known about them until his notebooks were discovered after his death. His inventions have continued to inspire engineers and scientists to this day.

i have tried my best to describe the Genius , i appreciate your comments in comment section....

Regards


Tahir Ahmad Dawood





Sunday, March 28, 2021

Our Solar System Exploration.


Our Solar System is one of over 500 known solar systems in the entire Milky Way galaxy. The solar system came into being about 4.5 billion years ago, when a cloud of interstellar gas and dust collapsed, resulting in a solar nebula, a swirling disc of material that collided to form the solar system. The solar system is located in the Milky Way's Orion star cluster. Only 15% of stars in the galaxy host planetary systems, and one of those stars is our own Sun.

Sun:  The Sun is the star at the center of the Solar System. Age is 4.5 Billion Years,  It is a nearly perfect sphere of hot plasma,heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as visible light and infrared radiation. It is by far the most important source of energy for life on Earth. Its diameter is about 1.39 million kilometres (864,000 miles), or 109 times that of Earth. Its mass is about 330,000 times that of Earth, and accounts for about 99.86% of the total mass of the Solar System.[20] Roughly three quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.The Sun is travelling at 220 km per second. 

1) BIGGEST: If the Sun were as tall as a typical front door, Earth would be about the size of a nickel.

2) MOST MASSIVE: The Sun is the center of our solar system and makes up 99.8 percent of the mass of the entire solar system.

3) DIFFERENT SPINS: At the equator, the Sun spins once about every 25 days, but at its poles the Sun rotates once on its axis every 35 Earth days.

4) CAN’T STAND ON IT:  As a star, the Sun is a ball of gas (92.1 percent hydrogen and 7.8 percent helium) held together by its own gravity.

5) RINGLESS: The Sun does not have any rings.

6) NUCLEAR FUSION: The Sun's core is about 27 million degrees Fahrenheit (15 million degrees Celsius).

7) MOONLESS: But orbited by eight planets, at least five dwarf planets, tens of thousands of asteroids, and up to three trillion comets and icy bodies.

8) WHAT WE SEE:  The Sun’s visible surface sometimes has dark sunspots, which are areas of intense magnetic activity that can lead to solar explosions.

Sun Rotation Speed: The sun revolves around the center of the Milky Way Galaxy with a speed of 1.997 km/s. On the other hand, rotate means to spin on an axis. The Earth rotates every 24 hours. The sun rotates, but not at a single rate across its surface,The sun itself also rotates in a counterclockwise direction. The satellites of the planets also generally revolve and rotate in a counterclockwise direction.

(Our sun is located about two-thirds of the way out from the center of the Milky Way. (Illustration via Caltech)

How will the Sun die? 

After fusing helium in its core to carbon, the Sun will begin to collapse again, evolving into a compact white dwarf star after ejecting its outer atmosphere as a Planetary Nebula. The predicted final mass is 54.1% of the present value, most likely consisting primarily of carbon and oxygen.

While the sun may have 5 billion years left before it runs out of fuel, life on Earth will likely be wiped out long before that happens.

Revolving Around the Sun are Eight Planets : In the first Phase of the blog we will discuss Terrestrial planets: The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a compact, rocky surface like Earth's terra firma. The terrestrial planets are the four innermost planets in the solar system.The other fours will be discussed in the 2nd phase of the blog, "The Jovian Planets".
  

 

The planets are divided into two categories, based on their composition, Terrestrial and Jovian. Terrestrial Planets including Mercury, Venus, Earth,and Mars, are primarily made of rocky material. Their surfaces are solid, they don't have ring systems, they have very few or no moons, and they are relatively small. The smallest and closest to the sun is Mercury.

Whereas , The Jovian planets are Jupiter, Saturn, Uranus, and Neptune. They orbit far from the sun. These planets have no solid surfaces and are essentially large balls of gas composed primarily of hydrogen and helium. They are much larger than the terrestrial planets.


Planet Mercury: 

Which has the shortest orbit in the solar system at about three Earth months. No evidence for life has been found on Mercury. Daytime Temperatures can reach 430 degrees Celsius (800 degrees Fahrenheit) and drop to -180 degrees Celsius (-290 degrees Fahrenheit) at night. It is unlikely life (as we know it) could survive on this planet. The inhalation of mercury vapour can produce harmful effects on the nervous, 
digestive and immune systems, lungs and kidneys, and may be fatal. The inorganic salts of mercury are corrosive to the skin, eyes and gastrointestinal tract, and may induce kidney toxicity if ingested. 

Inside Mercury:

Mercury Mercury is the second densest planet, after Earth. It has a large metallic core with a radius of about 1,289 miles (2,074 kilometers), about 85 percent of the planet's radius. There is evidence that it is partly molten, or liquid. Mercury's outer shell, comparable to Earth's outer shell (called the mantle and crust), is only about 400 kilometers (250 miles) thick.




Orbit and Rotation:

It speeds around the Sun every 88 days, traveling through space at nearly 29 miles (47 kilometers) per second, which is at an average speed of 105,947 miles (170,505 kilometers) per hourfaster than any other planet. Mercury spins slowly on its axis and completes one rotation every 59 Earth days. Mercury is 66.695 million km away from the Sun and 179.99 million km from Earth.


Planet Venus: is the hottest planet, with temperatures of up to 867 degrees Fahrenheit, due to an atmosphere of carbon dioxide and extensive lava flows. Nothing could live on what passes for land on Venus; its smooth volcanic plains are a scorching hellscape hot enough to melt lead, where the temperatures exceed 800 degrees Fahrenheit. High in the clouds, however, the pressures and temperatures and acidity levels would be less intense — though still vile. The distance from the Sun is 108.64 million km, and from the Earth is 257.78 million km.

Inside Venus : Venus has a rocky crust, a thick basaltic rock mantle and a nickel-iron core.There is no surface water.The surface of Venus has been mapped through its cloud layer using radar.

The surface of Venus is covered with roughly 20 percent lowland plains of solidified lava, 70 percent rolling uplands, and 10 percent highlands (volcanos, craters, mountains). The two major plains are called Aphrodite Terra Highlands (about half the size of Africa) and Ishtar Terra (a lava-filled basin which is bigger than the United States). At the surface, there are relatively slow winds. Venus does not have a very strong magnetic field; this may be because of the planet's slow rotation or perhaps Venus' core lacks a molten outer layer.

Orbit and RotationIt takes about 243 Earth days to spin around just once. Because it's so close to the sun, a year goes by fast. It takes 225 Earth days for Venus to go all the way around the sun with a speed of 35.02 km/s.



Next to this world of fire is a world of water.

Planet Earth: The water systems on this planet help create the only known environment in the universe capable of sustaining life. The last of the terrestrial planets. Earth, our home, is the third planet from the sun. It's the only planet known to have an atmosphere containing free oxygen, oceans of water on its surface and, of course, life. Earth is the fifth largest of the planets in the solar system. It's smaller than the four gas giants — Jupiter, Saturn, Uranus and Neptune — but larger than the three other rocky planets, Mercury, Mars and Venus.

Earth happens to lie within the so-called "Goldilocks zone" around the sun, where temperatures are just right to maintain liquid water on our planet's surface.

Earth has a diameter of roughly 8,000 miles (13,000 kilometers) and is round because gravity pulls matter into a ball. But, it's not perfectly round. Earth is really an "Oblate Spheroid," because its spin causes it to be squashed at its poles and swollen at the equator.


Inside Earth:

Earth's core is about 4,400 miles (7,100 km) wide, slightly larger than half the Earth's diameter and about the same size as Mars' diameter. The outermost 1,400 miles (2,250 km) of the core are liquid, while the inner core is solid; it's about four-fifths as big as Earth's moon, at some 1,600 miles (2,600 km) in diameter. The core is responsible for the planet's magnetic field, which helps to deflect harmful charged Particles Shot from the sun.

Above the core is Earth's mantle, which is about 1,800 miles (2,900 km) thick. The mantle is not completely stiff but can flow slowly. Earth's crust floats on the mantle much as a piece of wood floats on water. The slow motion of rock in the mantle shuffles continents around and causes earthquakes, volcanoes and the formation of mountain ranges.


Orbit and Rotation

The earth rotates once every 23 hours, 56 minutes and 4.09053 seconds, called the sidereal period, and its circumference is roughly 40,075 kilometers. Thus, the surface of the earth at the equator moves at a speed of 460 meters per second--or roughly 1,000 miles per hour.

The earth is moving about our sun in a very nearly circular orbit. It covers this route at a speed of nearly 30 kilometers per second, or 67,000 miles per hour. In addition, our solar system--Earth and all--whirls around the center of our galaxy at some 220 kilometers per second, or 490,000 miles per hour. As we consider increasingly large size scales, the speeds involved become absolutely huge!

Planet Mars:  Might have also supported life about 3.7 billion years ago, when the planet had a watery surface, and moist atmosphere. Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, being larger than only Mercury. In English, Mars carries the name of the Roman god of war and is often referred to as the "Red Planet". its Gravity: 3.711 m/s² , Distance from Sun: 227.9 million km and 
Radius: 3,389.5 km. Beyond the four Terrestrial planets of the inner solar system lie the Jovian planets of the outer solar system. Mars has only a thin atmosphere, with a surface pressure less than a hundredth of the Earth's. Even worse, it is 96% carbon dioxide with only about 0.1% oxygen, An astronaut on Mars would not be able to breathe the Martian air and would need a spacesuit with oxygen to work outdoors.

Inside Mars:  Its surface is covered with deep canyons and huge, inactive volcanoes. The soil on Mars contains a substance called iron oxide, which gives the planet a red color. Like Earth, Mars also has a core, mantle, and crust. Mars is lighter for its size than the other rocky planets.The planet’s crust might be made of three layers. This is the first time scientists have directly probed the inside of a planet other than Earth, and will help researchers to unravel how Mars formed and evolved over time. Before this mission, researchers had measured only the interior structures of Earth and the Moon. “This information was missing, until now, from Mars,”

Orbit and Rotation:

Mars has an orbit with a semimajor axis of (228 million km), and an eccentricity of 0.0934. The planet orbits the Sun in 687 days and travels making the average orbital speed 24 km/s, around the Sun. (53,853 miles per hour), or a period of about 686.93 days.


till now i have discussed about four planets in detail , the next four (Jovian planets) will be explore like above in the 2nd phase of the blog. i hope that you will enjoy by readiing it , your precious comments will be higly appericiated.

to be continued .......................


Regards

Tahir Ahmad Dawood