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.

2004 November 20
See Explanation.  Clicking on the picture will download
 the highest resolution version available.

Stereo Phobos
Credit: G. Neukum (FU Berlin) et al., Mars Express, DLR, ESA

Explanation: Get out your red/blue glasses and float next to Phobos, grooved moon of Mars! Also featured in yesterday's episode, the image data from the Mars Express High Resolution Stereo Camera was recorded at a distance of about 200 kilometers. This tantalizing stereo anaglyph view shows the Mars-facing side of the asteroid-like moon's cratered and grooved surface. Up to hundreds of meters wide, the mysterious grooves may be fractures related to the impact which created 10 kilometer wide Stickney crater, the large crater at the left.

Tomorrow's picture: when galaxies collide ...

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