Astronomy Picture of the Day · February 21, 2003

Melting Snow and the Gullies of Mars

The Astronomy Picture of the Day for February 21, 2003 is “Melting Snow and the Gullies of Mars,” an image. It is credited to Credit: P. Christensen (ASU), THEMIS , Mars Odyssey , NASA. The original explanation runs about 171 words.

From the explanation

“Tantalizing images of gullies on Mars have offered striking evidence for recent flows of liquid water. But Mars is too cold and its atmosphere too thin for liquid water to exist on the surface .”

— APOD editors, February 21, 2003

Read the full explanation on science.nasa.gov

At a glance

Date: February 21, 2003
Type: Image
Credit: Credit: P. Christensen (ASU), THEMIS , Mars Odyssey , NASA
Copyright: No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length: About 171 words

All of February 2003 → · 2003 by month → · Full archive since 1995 →

Topics in this entry

Mars

Topics are matched from words in the title and explanation.

On this day: February 21 in other years

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Source

Astronomy Picture of the Day, February 21, 2003 — science.nasa.gov/image-article/apod-2003-february-21-melting-snow-and-the-gullies-of-mars

Copy taken Oct 28, 2026, 2:39 AM EDT. The image and explanation belong to their creators. OpenOrbit is not affiliated with or endorsed by NASA.