Mercury is the smallest of the 8 planets in the solar system. Mercury is the closest to the sun, but it is not the hottest. Venus, the planet next to it is. Mercury was named after a roman messenger god named mercury and also a traveler god both because it is fast at moving around the sun. Mercury has no moons. It cannot have any because it cannot sustain one since it is too close to the sun. It's Polar diameter is 4,879. It's orbit period is 87.97. Mercury is an interesting planet and it was really fun to research on Mercury. To know more on Mercury's spacecrafts and discovery, see Spacecrafts and People Who Discovered Space.
Venus is some record breaker. Though not the closest from the sun, Venus is the hottest planet in the solar system from all 8 planets. Venus has hot clouds surrounding it that take in hot temperatures and make Venus really hot. Venus is named after the Roman goddess of love and beauty. Venus is sometimes called Earth's Twin, because in size, Venus and Earth look almost the same. Venus is also next to Earth. Some say that Venus is so hot that it melts it's own surface! Venus has no moons. It is a mystery to scientists why it does not have any. Not many people have discovered Venus since it is kind of clear to everyone in the sky sometimes.
Earth is the 3rd planet from the sun. Earth is the only planet known to have life on it. The planet next to Earth, Mars, may have life! Earth's Atmosphere is made up of Carbon Dioxide, Oxygen, and mostly Nitrogen. There are also other gases. Earth is made up of 29% land and 71% water. Earth is the only planet in the solar system known to have water. Earth has only one moon, which is the Moon. 12 astronauts went on the moon, 3 flew back but did not go on the moon twice.
Mars is one of those planets EVERYONE'S trying to get information on. The main question going around is: Is there other life out there? Well we don't know for sure, but we hopefully soon will find out. Mars is also called the red planet, because of its reddish color. Mars's atmosphere is 95.3 carbon dioxide, 2.7 percent nitrogen, and the rest is other gases. Mars is named after Greeks, who's god Ares was the god of war. But then the Romans renamed the gods and called Ares Mars. Some people think there is life on Mars. Most scientists think that there are no signs of life. On Mars, there is only 2 moons. Phobos and Deimos. Some think that there might be some life organisms or even water found on Mars. I, personally think that there is no life on Mars and there will never be. But we still have to wait and see...
I always liked to study something about Jupiter. If you take a look at the picture over on the left of this, You will see a reddish dot on the lower right of Jupiter. It is called Jupiter's Great Red Spot. It can fit 3 Earths and it is just a big hurricane 3 times Earth! It is so cool! But that is only like 1 out of 1000 the size of Jupiter. That is right! Jupiter is the biggest planet in the solar system. Jupiter can fit 1000 Earths! Jupiter's atmosphere is made of molecular hydrogen and helium. There is also a little bit of methane, ammonia, hydrogen sulfide, and even water! Jupiter has big storms, and sometimes, well usually, they come with lightning strikes. Some scientists think that the GRS's, ( Great Red Spot ) color comes from maybe red phosphorus. But scientists aren't really sure yet. The 2nd largest spot on Jupiter is Oval B.A . It is sometimes called the little red spot, red spot jr. or other names. It is also some kind of storm. Jupiter is the biggest planet in the Solar System, and it also has the biggest moon in the solar system, called Ganymede. It is so big you can see it with a pair of binoculars. Jupiter has 53 moons in total.
One of the reasons Saturn is the planet that gets the most talk is because of Saturn's rings. Saturn has rings around it that are made of billions of pieces of dust rock and ice. Some of the pieces are a small as grains of sand, and some are even as big as houses! Saturn's atmosphere is made of mostly hydrogen. there is also a little bit of helium. There is also very little methane and ammonia. also within the atmosphere there is some oxygen and nitrogen. One day on Saturn is 10 hours and 39 minutes. That is almost half of our day! Saturn is named after the Roman god of time. In mythology, Saturn is the father of Jupiter. Saturn has 53 moons. On of its moons has its own atmosphere (Titan).
Uranus is the first planet from the 2 ice giants. Uranus is very far from the sun. it is 1,787,000,000 miles away! More than a billion miles away! The interior of Uranus is mostly ices and rock. It is tilted on its side with an axial tilt of 18 degrees! It's polar diameter is 49,946 km. Some Moons: Oberon, Titania, Miranda, Arial, and Umbriel. It has 13 known rings. Uranus has 27 known moons. Some of them are even half made of ice! The upper atmosphere is made up of a methane haze. It has a -197 C temperature!.
Neptune, a very fascinating planet, is the farthest of all eight planets from the sun. Neptune is really pretty, and it is a deep blue. On average, Neptune is the coldest planet since it is farthest from the sun. If Pluto was still here, then it would be the coldest. But on its highest, Uranus is colder than Neptune! Neptune is called an ice giant. Neptune is dark and whipped by supersonic winds. It takes about 16 hours for Neptune to rotate once time. The polar diameter of Neptune is 48,682 km. The atmosphere of Neptune is 80 percent Hydrogen and 19 percent helium. On Neptune, there are many white clouds made of Methane ice. A day on neptune is very short, only 16 hours and 6 minutes long! Neptune has 13 moons. The biggest one, Triton, is almost as big as Pluto!