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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.

An orange landscape is seen with many darker rocks visible in the foreground. Toward the image top is a large rock outcrop with orange sand on top. The outcrop may appear to resemble a large turtle. Please see the explanation for more detailed information.

Turtle Rock on Mars

Explanation: Is this a fossilized turtle on Mars? No. Although resembling a large Earth tortoise , this is a layered rock outcrop on Mars that is estimated to span about 15 meters, making it much larger than turtles on Earth . NASA’s robotic Curiosity rover came across this unusual mound , dubbed Miraflores, last month during its 4922nd Martian day exploring Mars. The small butte may survive because it was somehow more resistant to erosion than surrounding rock. More recent wind has now covered its top with orange Martian sand . Below the top shell, many layers of stratified rock are visible , possibly indicating a long history of intermittent wind-blown sand being deposited and then hardened by ground water. Similar wind-eroded layered landforms, such as yardangs in the Qaidam Desert of China , exist here on Earth. Curiosity and its companion rover Perseverance continue to investigate the ancient history of Mars as well as searching for signs of primeval life .

Date July 21, 2026
Credit Image Credit: NASA / JPL-Caltech / MSSS ; Processing & License : Thomas Thomopoulos
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.