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Mars has a very thin atmosphere that is mostly carbon dioxide (90%). Based on the evidence we have today, it had a thicker atmosphere at one point that eroded away.

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Mars is the 2nd smallest planet in the solar system. It's smaller than Earth but bigger than Mercury with a radius of 2,106 miles.

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Mars has the largest volcano in the entire solar system, Olympus Mons. It may or may not still be active. We know it was at one point because of the lava tubes it created under Mars surface. These lava tubes might lead to the possibility of humans inhabiting Mars in the future. The tubes would be used as shelter from the radiation on Mars surface.

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There is frozen water on Mars. Underneath the ground they have deposits of ice and frozen ice on the North and South Poles of ice. Weather there is liquid water or not is debatable.

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There's Water On Mars! Here's Everything you Need to Know

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Water on Mars. Seems like we've been here before. So, why is NASA's most recent announcement different? Come see us at DNews After Dark! ►►►► http://dne.ws/1Fa2OCh Watch more DNews!

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Mars has two moons named Phobos and Deimos. They are both relatively small. Below is a picture of Phobos.

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Mars has the strongest evidence that it supported life than any other planet in our solar system. The rover Curiosity found the key ingredients for life in rock samples. Also, the presence of methane on the planet indicates the possibility for life today. There is a strong possibility that Mars used to be Earth-like and may even have bacteria and micro-organisms surviving under the surface.

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The soil on mars is red because the iron in it has been oxidized. Percolate salts have also been discovered in the soil.