The planets in the Solar System

Universe today

Let’s run through entire Solar System and learn about all the planets in the Solar System. Each planet refers to a whole section about that planet, so you can find out more if you want. Enjoy a tour around the Solar System.


As you travel from the Sun mercury is the closest planet. It is in orbit around the Sun at an average distance of 58 million kilometers. Mercury is airless, and so without any significant atmosphere to hold heat, it has strong temperature changes. The side that faces the Sun experiences temperatures of 420 ºC, and the other side in shadow has a temperature of -173 ºC. Mercury is the smallest planet in the Solar System, having a diameter at the equator to 4879 km

Mercury watched only twice a spaceship. The first was Mariner 10 in the mid-1970s. And in 2008 another space ship from Earth. made a close flyby of mercury and photograph its surface.


Venus is the second planet in the Solar System. and she is almost a twin of Earth in terms of size and mass. Venus revolves in an orbit at an average distance from the Sun is 108 million kilometers, and completes an orbit every 224 vokrugsveta day. In addition to size, Venus is very different from Earth. It has a very dense atmosphere consisting almost entirely of carbon dioxide that covers the planet and helps to heat it up to 460 °C. If you could stay on the surface of Venus, you would feel the pressure 92 times greater than Earth’s atmosphere, with incredibly high temperatures and toxic clouds of carbon dioxide and rains of sulfuric acid.

Several spacecraft have visited Venus, and several landing module sat on the surface, to send back pictures of her hellish landscape. Even though they were made of metal, these landing units lasted only a few hours.


The earth is our home; the third planet from the Sun. It is orbiting the Sun at an average distance of 150 million kilometers. Earth is the only planet in the Solar System, famous for maintaining life. This is because our atmosphere keeps the planet warm from the vacuum of space, but it is not so dense that we avoid the greenhouse effect. The earth has a solid core of iron surrounded by a liquid outer bark, which creates a magnetic field, which also helps to protect life on Earth from radiation from space.

No planet in the Solar System has not been studied as well as Earth, both on earth and in space. Thousands of spacecraft were launched to study the planet, measuring its atmosphere, the earth’s mass, vegetation, water and human impact.

The earth has only one moon. The moon.


4th planet from the Sun is Mars. the second smallest planet in the Solar System. It is in orbit around the Sun at a distance of 228 million kilometers. You might think that Mars is big, but it’s a tiny world with half the diameter of Earth and only 1/10 the mass of Earth. If you’d been standing on the surface of Mars, you’d have about 1/3 the gravity of Earth. Mars has almost no atmosphere to help catch heat from the Sun, so temperatures can drop below -140 °C in the Martian winter. Even in summer the temperature can rise to 20 °C.

Mars is well studied spaceships. On its surface there are the Rovers and landing modules, orbital vehicles fly above. This is the most likely place to find life in the Solar System.

Mars has two tiny moons, about the size of asteroid: Phobos and Deimos.


Mighty Jupiter is the largest planet in our Solar system. It’s so big that 2.5 times the mass of all other planets in the solar System combined. Jupiter is orbiting the sun at an average distance of 779 million kilometers. Its diameter at the equator is 142,984 km; you could fit 11 Earths side by side and still have some space. Jupiter is almost all hydrogen and helium with negligible amounts of other elements.

Jupiter was visited by several spacecraft, including spacecraft NASA’s Pioneer and Voyager; Cassini and New Horizons arrived there recently. Only the spacecraft Galileo entered orbit around Jupiter and crashed into the planet in 2003 to prevent it from pollution one of the icy moons of Jupiter.

Jupiter has the most moons in the Solar System has 67 moons at last count.


Saturn is the 6th planet from the Sun. and the 2nd biggest planet in the Solar System. It is in orbit around the Sun at an average distance of 1.4 billion kilometers. Saturn has a diameter of 120,000 km, only slightly smaller than Jupiter. But the Saturn has a much smaller mass, and therefore it has a low density. In fact, if you would have a large enough pool, the Saturn would have swam in it!

Of course, the most striking feature of Saturn is its rings. They consist of ice particles range in size from grains of sand to the car. Some scientists believe that the rings are aged only a few hundred million years, while others believe that the same old as the solar System itself.

Saturn was visited by the spacecraft 4 times: Pioneer 11, Voyager 1 and 2 just did a flyby, and Cassini went into orbit around Saturn and shot thousands of Photos of the planet and its moons.

And speaking of moons, Saturn, as of February 2010, has 62 satellites.


Next comes Uranus, the 7th planet from the Sun. It is in orbit around the Sun at an average distance of 2.9 billion kilometers. Uranium has a size of 51,000 in diameter and is the 3rd biggest planet in the Solar system. Although all the planets are tilted on their axes, Uranus is tilted almost on its side. It has an axial tilt of 98 degrees. Uranus was the first planet discovered by telescope; it was first recognized as a planet in 1781 by William Herschel.

Only one spacecraft, Voyager 2. visited Uranus close. It passed the planet in 1986 and took the first close Photographs.

Uranus has 27 known moons.


Neptune is the 8th and last planet in the Solar System. orbiting at an average distance of 4.5 billion kilometers from the Sun. This is the 4th biggest planet having dimensions of about 49,000 km in width. He’s not as big as Jupiter, but is still 3.8 times larger than Earth – you could fit 57 Earths inside Neptune. Neptune is the second planet discovered in the modern era. It was opened at the same time as Urbain Le Verrier and John Couch Adams.

Neptune was visited by only one spacecraft, Voyager 2 which made a flyby in August 1989.

Neptune has 13 known moons.

And this is a planet in the Solar system. Unfortunately, Pluto is not a planet anymore.

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