火星壁纸
by NASA/JPL-Caltech/ASI/University of Rome/PSI/Smithsonian Institution
NASA Image Library · 公有领域（Public Domain）
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This radargram shows data collected by the Shallow Radar, or SHARAD, on NASA's Mars Reconnaissance Orbiter (MRO) on May 2, 2023, as it performed a 120-degree roll maneuver called a "very large roll" over a formation named Medusae Fossae. Scientists used SHARAD to look for ice beneath the surface of this region. Designed to peer from about a half-mile to a little over a mile (1 to 2 kilometers) below ground, SHARAD emits radio waves that are reflected off materials in the subsurface, measuring how long it takes for those waves to bounce back to the instrument. The longer it takes, the deeper t…
