The discovery of a vast, fresh impact scar on Mars began with what looked like a smudge in a routine weather snapshot. A camera built to monitor daily clouds and dust storms ended up flagging the ...

Earth and Mars showed very different responses to the same solar storm.

NASA’s ESCAPADE mission will launch twin satellites to orbit Mars and study how solar wind interacts with the planet’s magnetic field and atmosphere.

Add Yahoo as a preferred source to see more of our stories on Google. As Mars’ atmosphere continues to change, Nasa activated a new instrument on Wednesday to study how the Sun influences the planet ...

This image, combining data from two instruments aboard NASA's Mars Global Surveyor, depicts an orbital view of the north polar region of Mars. The ice-rich polar cap (the quasi-circular white area at ...