Mars greenhouse by Les Bossinas

Picture of the Day 22/4/14 - Mars greenhouse (1991) by NASA's concept artist Les Bossinas.

Astronauts exploring Mars by Ren Wicks

Picture of the Day 15/4/14 - A classic work "Mars mission" (1990) by American artist Ren Wicks. More of his Mars art here.

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Astronaut working on Mars by unknown artist

Picture of the Day 10/4/14 - Can anyone point me out the author of this Mars artwork? Leave in comments...

Mars base by Georgi Petrov

Picture of the Day 8/4/14 - A Mars base by architect Georgi Petrov.

Astronauts exploring Valles Marineris by Sean Brady

Picture of the Day 7/4/14 - Exploration of Valles Marineris (2009) by Sean Brady from United Kingdom.