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, and
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 Subsurface
Researchers working with the European Space Agency’s Mars Express spacecraft have found strong evidence for a sub-glacial lake of liquid water under Mars’ southern polar ice cap.