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发帖数: 1994 | 1 X-Ray Moon
Credit: J. Schmitt et al., ROSAT Mission, MPE, ESA
Explanation: This x-ray image of the Moon was made by the orbiting ROSAT
(R?ntgensatellit) Observatory in 1990. In this digital picture, pixel brightness corresponds to
x-ray intensity. Consider the image in three parts: the bright hemisphere of the x-ray moon,
the darker half of the moon, and the x-ray sky background. The bright lunar hemisphere
shines in x-rays because it scatters x-rays emitted by the sun. The backgrou |
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