URANUS
· Uranus is the seventh planet from the sun. · Uranus is the about four times bigger than Earth. · Uranus is made out of various materials, like water ammonia and methane. · Uranus has three layers inside it · Uranus has a rocky core at the centre. · Uranus has an icy mantle that surrounds it. · Uranus is the third largest planet in the solar system. · Uranus has an outer gas envelope of hydrogen and helium. · The core of Uranus is very small. · Uranus was officially discovered by Sir William Herschel in 1781. · At first Herschel thought it was a comet, but several years later it was confirmed as a planet. |
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Mercury is 36 million or 58 million
kilometres from the Sun. Mercury is the planet closest to the Sun.
· Mercury is the smallest planet in both mass and diameter. It is about 18 times smaller than the Earth. · Mercury is covered with asteroid craters on the surface and covered by dusty layers of minerals. The surface is made up of plains, cliffs, and craters. · For every two orbits of the sun, Mercury can be observed from the Earth passing across the face of the sun. Mercury constantly faces the sun. One day on Mercury lasts the equivalent of 176 Earth days. lick here to edit. |
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Neptune
· It takes Neptune 16 hours and 17 minutes to rotate once around the sun. · Neptune is 4.496 million metres from the sun. · The average temperature on Neptune is 184 degrees Celsius. · neptune is the eighth planet in the solar system. at this distance the sun and asteroid belt look very small. · Neptune’s atmosphere is made of hydrogen and helium and methane. · The diameter of Neptune is 49.527 kilometres. · For many centuries people thought Neptune didn’t even exist. Neptune was discovered by john gale and hienrich d’arrest in 1846. · Neptune is the smallest of all 4 gas giants. · Not much was known about Neptune until it was visited by the spacecraft voyoger2 on august 25 1985. When voyager 2 visited Neptune it took pictures of a storm much like the storm on Jupiter. This storm is called the great dark spot because it appears as a dark oval shape on the surface of the planet. The Hubble space telescope sent pictures of the storm but it faded away. · Neptune is a very windy place. The winds near the great dark spot having reached 1200 miles per hour. · Neptune has six rings. These rings are believed to be fairly new. The rings are more irregular than the rings of other planets. There are areas of varying thickness throughout the rings. · Neptune has 13 moons we know of. Because Neptune is so far away we can’t see any of these worlds. There are probably many more of these moons that Orbit this blue planet that we have not yet discovered. The first moon to be discovered was triton. The sun · The sun is a star. A star does not have a solid surface but is a ball of gas (92.1 percent hydrogen and 7.8 percent helium held together by its own gravity). · The sun is the centre of our solar system and makes up 99.8% of the mass of the entire solar system. · If the sun were as tall as a typical front door, Earth would be about the size of a nickel. · Most of the gas (about 72 percent) is hydrogen. Nuclear fusion converts hydrogen into other elements. The sun is also composed of about 26 percent helium and trace amounts of other elements including oxygen, carbon, neon, nitrogen, magnesium, iron and silicon. By Andrew |