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Solar System

Solar System cool
 
        Mercury is the closest planet to the sun. It is the smallest planet in the solar system. The temperature on Mercury can vary from -180oC to 427oC. Its surface has many craters like our Moon and it has a thick iron core. Because it is so close to the sun, its atmosphere is not stable like the Earth’s.
 
        Venus is the second planet from the sun. It is almost the same size as Earth and has the same gravity. It is much hotter than Mercury, which is closer to the sun. The temperature on Venus is about 465oC. There are also many volcanoes and craters on Venus. It spins very slowly; one Venus day is 243 Earth days, but it also spins backwards, unlike the other planets. There are no oceans there like on Earth and it has mostly carbon dioxide in its atmosphere. It has many clouds full of acid.
They call it the ‘Evening/Morning Star’ because it is very bright and you can see it at sunset and sunrise.
 
        Earth is the third planet from the sun. They call it the ‘Water Planet’. It’s the only planet with liquid water, which covers 70% of the surface. There are big oceans and clouds. The clouds are full of water vapour. The atmosphere is full of oxygen with
a mix of nitrogen, carbon dioxide and other gases. It is the only planet in our solar system where animals, plants and humans can live.
 
        Mars is the fourth planet from the sun. They call it the ‘Red Planet’ because of its colour. It has a rocky and sand like surface. Mars spins faster than other planets; one year on Mars is the same as 687 Earth days. This planet has an atmosphere of air with carbon dioxide, nitrogen and oxygen. However, there is not enough oxygen for humans to live there. There are strong winds and very big dust storms.
 
        Jupiter is the fifth planet from the sun. It is also the largest in the solar system. It is
a gas planet because its atmosphere is mostly hydrogen. There are many storms on Jupiter. One storm we call the ‘Red Eye’ or ‘Red Spot’ is twice the size of Earth and is 300 years old. Jupiter has at least 16 moons and it also has rings like Saturn.
 
 
        Saturn is the sixth planet from the sun. It’s the second largest planet in the solar system. Like Jupiter, it has mostly hydrogen in its atmosphere. It takes Saturn about 10,759 Earth days (or 29.5 years!) to travel around the sun. The planet has a system of rings around it and 62 moons, too. One of these is even bigger than the planet Mercury.
 
        Uranus is the seventh planet from the sun. Its days are very short; about 17 hours long. One year is equal to 84 Earth years. This means that it completes one rotation around the sun once in our lifetime. It has at least 20 moons and rings like Saturn and Jupiter, but they are very thin. It is full of methane gas, but it is so cold on Uranus that it is frozen all the time. It looks bluish-green because of the methane. Winds can blow up to 515 kilometres per hour.
 
        Neptune is the eighth planet from the sun. It is full of methane gas and it is blue like Uranus. One year on, Neptune is 165 Earth years. While Jupiter has the ‘Red Spot’, Neptune has a ‘Great Dark Spot’. Scientists do not believe it is a storm but a hole in the atmosphere.
19 สค. 2565 เวลา 15:54 น. 0 264
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