NASA’s Curiosity rover has found that the oxygen levels in the air in the Mars’s Gale Crater change along with the seasons on the Red Planet, rising in the spring and summer and falling during the winter. This follows Curiosity’s discovery that Martian methane also fluctuates with the seasons, andread more

The European Space Agency’s (ESA) Mars Express orbiter has uncovered signs that Mars once had a vast network of waterways, including a planet-spanning ocean in its northern hemisphere, and an extensive network of rivers that carved majestic canyons through the ancient Martian landscape. Using its Mars Advanced Radar for Subsurfaceread more

Although it’s found on another planet altogether, there’s a permanent "winter wonderland" on Mars that would never suffer a green Christmas — or a red one, as the case may be. The European Space Agency’s Mars Express orbiter used its High Resolution Stereo Camera (HRSC) to take pictures of the 82 kilometer (51 mile)-wide Korolev crater near Mars’ north pole, home to a massive mound made of water ice that persists year-round due to the crater’s peculiar topography.

Korolev crater’s ice sheet is 1.8 kilometers (1.1 miles) deep, and with a volume of 2,200 cubic kilometers (530 cubic miles), the ice pack holds a similar amount of water in ice form as Canada’s Great Bear Lake, or five times that of Lake Erie. read more