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Explanation: They might look like trees on Mars, but they're not. Groups of dark brown streaks have been photographed by the Mars Reconnaissance Orbiter on melting pinkish sand dunes covered with light frost. The above image was taken in 2008 April near the North Pole of Mars. At that time, dark sand on the interior of Martian sand dunes became more and more visible as the spring Sun melted the lighter carbon dioxide ice. When occurring near the top of a dune, dark sand may cascade down the dune leaving dark surface streaks -- streaks that might appear at first to be trees standing in front of the lighter regions, but cast no shadows. Objects about 25 centimeters across are resolved on this image spanning about one kilometer. Close ups of some parts of this image show billowing plumes indicating that the sand slides were occurring even when the image was being taken.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: Mars - sand
Publications with words: Mars - sand
See also:
- APOD: 2025 July 15 B Collapse in Hebes Chasma on Mars
- APOD: 2025 July 6 B The Spiral North Pole of Mars
- APOD: 2025 June 29 B Dark Sand Cascades on Mars
- APOD: 2025 June 22 B A Berry Bowl of Martian Spherules
- APOD: 2025 June 15 B Two Worlds One Sun
- Perseverance Selfie with Ingenuity
- Deimos Before Sunrise