the Solar System

Substantial scientific evidence suggests that Mars at one point billions of years ago was a much warmer, wetter world, rivers and maybe even oceans existed.

The largest planet in the solar system. The gas giant is more than twice as massive as all the other planets combined, according to NASA(opens.

Is the sixth planet from the sun and is famous for its large and distinct ring system. The rings are made of ice and rock and scientists are not yet sure how they formed.

It has clouds made of hydrogen sulfide, the same chemical that makes rotten eggs smell so foul

the coldest planet in the solar system. The average temperature of Neptune at the top of the clouds is minus 346 degrees Fahrenheit.

The sun is by far the largest object in our solar system.It sheds most of the heat and light that makes life possible on Earth and possibly elsewhere.

It is a water world with two-thirds of the planet covered by water. Earth's atmosphere is rich in nitrogen and oxygen and it is the only world known to harbor life.

It is the smallest planet in the solar system.Mercury zips around the sun in only 88 days and because it is so close to our star.

Its thick atmosphere is extremely toxic and composed of sulfuric acid clouds, the planet is an extreme example of the greenhouse effect.

It is smaller than Earth's moon; its orbit is highly elliptical, falling inside Neptune's orbit at some points and far beyond it at others