The ripples suggest that the lake was free of ice at one point.

The red planet Mars, named for the Roman god of war ... Not so today: Though water ice abounds under the Martian surface and in its polar ice caps, there are no large bodies of liquid water ...

and the planet cooled. Except for the scraps frozen into the polar caps, its water was lost to space or stored away as subsurface ice. And this all happened billions of years ago. The early Mars ...

Everyone knows that Earth is capable of providing beautiful, snowy landscapes, but it isn't unique in that. It snows on Mars, ...

NASA researchers have identified geological structures on Mars that are unlike anything found on Earth. From spider-like ...

The above image shows a 20-meter-long chunk of frozen carbon dioxide falling off a cliff. Rising temperatures during the ...

Earth’s ice caps exist due to a rare combination of cooling processes. Without these, Earth would likely remain warm and ...

Like Earth, Mars has polar ice caps, volcanoes, canyons and deserts ... Although Mars has much the same land mass as Earth, the planet is much smaller (about half the size).

We have wondered for centuries whether our neighbouring planet is home to life ... There is plenty of water on Mars, but most of it is frozen in the polar ice caps and buried underground.

Astronomers have identified sulfur as a potentially crucial indicator in narrowing the search for life on other planets.

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 ... carbon dioxide ice accumulates near the surface.

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 ...