If you've ever looked at Mars through a telescope, you probably noticed its two polar ice caps. The northern one is made ...

The north pole of Mars is slowly sinking under the weight of an ice cap that only formed within the past few million years. And, in the process, it's telling us something about what the planet's ...

Why it's so special: These odd, fan-like features on the surface of Mars are geysers of gas and dust near the planet's south pole that are visible only in springtime on the Red Planet. This image ...

How the geysers form During winter, carbon dioxide ice builds up on Mars' surface. Unlike Earth's ice, this frozen carbon dioxide is transparent. Sunlight passes through it, warming the ground ...