Frosted Dunes on Mars

Sand dunes cover much of this terrain, which has large boulders lying on flat areas between the dunes. It is late winter in the southern hemisphere of Mars, and these dunes are just getting enough sunlight to start defrosting their seasonal cover of carbon dioxide. Spots form where pressurized carbon dioxide gas escapes to the surface.
NASA Image of the Day

Human flights to Mars still at least 15 years off: ESA head

DARMSTADT, Germany (Reuters) - Dreaming of a trip to Mars? You'll have to wait at least 15 years for the technology to be developed, the head of the European Space Agency (ESA) said, putting doubt on claims that the journey could happen sooner.

Reuters: Science News