Four months ago, NASA landed a one-ton, nuclear-powered rover on the Red Planet, scattering the Martian terrain with heaps of debris in the process. Curiosity, upon arrival, shed so much of its Entry Descent & Landing hardware that high resolution images of the planet's surface are still turning up traces of the rover's …

Since 2006, NASA's HiRISE camera has been orbiting the Red Planet aboard the Mars Reconnaissance Orbiter, snapping photos of the planet's surface. In that time, it's also managed to photograph several of NASA's biggest Martian milestones as they happen. This is an image of one of those milestones.

Hey everyone, look! It's NASA's space litter!

A few hours ago, NASA's HiRISE team announced that it had acquired an image of Curiosity during its epic descent to the Martian surface. That image was originally scheduled to be released at NASA's morning press conference, scheduled for 9:00 am PT, but Spaceflight 101 and Discover magazine are reporting that the image …

As of this posting, we are just 2 days, 12 hours, and thirty minutes away from the Curiosity rover making touchdown on Mars. We're excited. NASA's excited. Even Angry Birds is excited.

One of the best ways to learn about a planet's history is to examine its geology, so one of the things scientists look for when sending rovers to Mars is areas on the planet's surface that allow access to multiple layers of diverse and interesting rock types.

Evidence of Mars' watery past continues to pile up, but details surrounding the extent and duration of the planet's hydrous history remain muddled — just how wet was Mars, really?

Remember a few weeks ago when astronomers spotted that "ghostly snake" of a twister creeping its way across the face of Mars? Well, the windstorm featured up top makes that other storm look like an adorable little dust-up.

It can be easy to forget, but Mars has clouds very similar to the the ones you find here on Earth. Don't believe me? Here, check out the first photograph ever taken of an overcast Martian sky; or this picture of some stratus clouds, captured about 40 minutes before a Martian sunrise. The thin sheets of cotton-white…

Mars may look red from here on Earth, but up close, the surface of the "Red Planet" is actually a variety of colors. In fact, many of them aren't very red-looking at all.