Mercury, which is the planet that is closest to the sun, is the first planet I will discuss. Mercury is the smallest of the inner planets. It is speculated that the heat from the sun made it impossible for the gases present to become part of the planetary formation. The surface of Mercury is extremely hot. It is approximately 470 degrees Celsius on the surface and is thought to be even hotter at the two " hot spots." These " hot spots " are on opposite ends of the equator. It is the heat of the surface that makes it impossible for Mercury to have any type of atmosphere.

Mercury orbits the sun once every 88 days and has a true rotation period of

The final planet, which is also the smallest and the furthest away from the sun is Pluto. This planet is very hard to see therefore not a lot is known about its physical characteristics. Scientists do know that it has a thin methane atmosphere. Little is known about this planet because it is so far away from the Earth and the sun. Scientists are always learning new things and more data will arise in the future.

Mars is extremely hard to understand due to the effect of blurring that is caused by the two atmospheres of Mars. Scientists do know, however, that Mars is relatively small and that changes take place in the surface features when the seasons change. It is also known that dust storms are prevalent and leaves the surface of Mars covered by a red haze.

The next planet is Uranus. The main problem scientists have with Uranus is that, the lack of visible surface features means that it is difficult to measure the rotation period of Uranus. Uranus has an equatorial diameter of 51,000 Km, which is almost four times as much as Earth. The atmosphere is mostly methane gas and therefore the planet has a red tint or a bluish green color. Uranus also has rings but

Some topics in this essay:
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