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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

See Explanation. Clicking on the picture will download the highest resolution version available.

Earth or Mars?

Explanation: Which image is Earth, and which is Mars? One of the above image s was taken by the robot Spirit rover currently climbing Husband Hill on Mars . The other image was taken by a human across the desert south of Morocco on Earth . Both images show vast plains covered with rocks and sand . Neither shows water or obvious signs of life . Each planet has a surface so complex that any one image does not do that planet justice . Understanding either one, it turns out, helps understand the other. Does the one on the left look like home? Possibly not, but it is Earth .

Date April 12, 2005
Credit Earth Image Credit & Copyright: Filipe Alves ;
Mars Image Credit: Mars Exploration Rover Mission , JPL , NASA
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.