Bruce Murray Space Image Library
Copernicus and Eratosthenes
Filed under pretty pictures, Lunar Reconnaissance Orbiter, the Moon
These two craters -- Copernicus, left, and Eratosthenes, right -- give their names to two of the Moon's geologic periods. The Copernican period is the most recent one; Copernican-age craters have visible rays. The Eratosthenian period is older than the Copernican; its craters do not have visible rays.
NASA / GSFC / ASU
A spot in this region (white arrow) was once considered a possible site for a future human base.
This image is in the public domain.
Original image data dated on or about August 5, 2010
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