NASA Science Briefing: Comet Siding Spring at Mars

Stratigraphy in Gale Crater on Mars indicates the effects of megafloods in the distant past, most likely caused by the heat released in a major impact.

A Russian Proton rocket rolled out to its launch pad at the Baikonur Cosmodrome in Kazakhstan on Friday, riding a specially-built rail car with Europe’s ExoMars mission bound for the red planet.

A bang and a whoosh – how researchers describe the recent impact of a small meteoroid on the side of a martian hill and a long avalanche of dark, dry dust that stretches more than a kilometre (0.6 mile) down the slope.