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Collection:
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NASA Astronomy Picture of the Day Collection
Collection
NASA Astronomy Picture of the Day Collection
Collection
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Title:
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Explanation:
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This X-Ray [ http://antwrp.gsfc.…] image of the Moon [ http://antwrp.gsfc.…] was made by the orbiting Roentgen Observatory Satellite (ROSAT [ http://heasarc.gsfc…]) in 1990. It shows three distinct regions: a bright X-ray sky, a bright part of the Moon, and a relatively dark part of the Moon. The bright X-ray sky is due to the diffuse cosmic X-ray background [ http://www.rosat.mp…]. The bright lunar crescent shines because it reflects X-rays emitted by the Sun [ http://antwrp.gsfc.…]. The dark lunar face is in shadow and so stands stands out from the relatively bright background - but, surprisingly it is not completely dark! Where do those X-rays from? They are currently thought to result from energetic particles from the solar wind [ http://www-spof.gsf…] bombarding the lunar surface.
Explanation
This X-Ray [ http://antwrp.gsfc.…] image of the Moon [ http://antwrp.gsfc.…] was made by the orbiting Roentgen Observatory Satellite (ROSAT [ http://heasarc.gsfc…]) in 1990. It shows three distinct regions: a bright X-ray sky, a bright part of the Moon, and a relatively dark part of the Moon. The bright X-ray sky is due to the diffuse cosmic X-ray background [ http://www.rosat.mp…]. The bright lunar crescent shines because it reflects X-rays emitted by the Sun [ http://antwrp.gsfc.…]. The dark lunar face is in shadow and so stands stands out from the relatively bright background - but, surprisingly it is not completely dark! Where do those X-rays from? They are currently thought to result from energetic particles from the solar wind [ http://www-spof.gsf…] bombarding the lunar surface. Explanation
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facet_when:
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1990
facet_when
1990
facet_when
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facet_where:
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Goddard Space Flight Center (GSFC)
facet_where
Goddard Space Flight Center (GSFC)
facet_where
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facet_where:
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Washington, D.C.
facet_where
Washington, D.C.
facet_where
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facet_what:
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Moon
facet_what
Moon
facet_what
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facet_what:
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Sun
facet_what
Sun
facet_what
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facet_what:
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ROSAT
facet_what
ROSAT
facet_what
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facet_what:
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moon
facet_what
moon
facet_what
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facet_when_year:
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1990
facet_when_year
1990
facet_when_year
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original url:
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original_url
original url
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UID:
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SPD-APOD-ap960929
UID
SPD-APOD-ap960929
UID
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