A false-color image of the Moon from NASA's Compton Gamma Ray Observatory's EGRET instrument. The Moon appears brilliantly bright due to gamma rays produced by cosmic rays impacting its surface, brighter than the Sun at these wavelengths. The image shows a wide field of view, also including gamma-ray emissions from the Milky Way galaxy and other sources.

Astronomy Picture from 17/04/1999

Gamma Ray Moon

Source: https://apod.nasa.gov/apod/ap990417.html


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