On some Martian nights, a subtle, green glow hangs low in the sky, wreathing the horizon in every direction. Compared to many Earthly aurora photos, the new image from Mars is fuzzy. There are a ...

The supernova remnant SNR 0509-67.5 view from the European Southern Observatory's Very Large Telescope, the expanding remains of a star that exploded hundreds of years ago in a double-detonation ...