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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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Uranus's Moon Umbriel: A Mysterious Dark World
Title
Uranus's Moon Umbriel: A Mysterious Dark World
Title
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Explanation:
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Why is Umbriel so dark? This dark moon reflects only half the light of other Uranus' [ http://antwrp.gsfc.…] moons such as Ariel [ http://antwrp.gsfc.…]. And what is that bright ring at the top? Unfortunately, nobody yet knows. These questions presented themselves when Voyager [ http://vraptor.jpl.…] 2 passed this satellite of Uranus [ http://antwrp.gsfc.…] in January 1986. Voyager found an old surface with unusually large craters, and determined Umbriel [ http://seds.lpl.ari…]'s composition to be about half ice and half rock. Umbriel [ http://bang.lanl.go…] is the fourth largest and third most distant of Uranus' five large moons. Umbriel was discovered in 1851 by William Lassell [ http://www.ast.cam.…].
Explanation
Why is Umbriel so dark? This dark moon reflects only half the light of other Uranus' [ http://antwrp.gsfc.…] moons such as Ariel [ http://antwrp.gsfc.…]. And what is that bright ring at the top? Unfortunately, nobody yet knows. These questions presented themselves when Voyager [ http://vraptor.jpl.…] 2 passed this satellite of Uranus [ http://antwrp.gsfc.…] in January 1986. Voyager found an old surface with unusually large craters, and determined Umbriel [ http://seds.lpl.ari…]'s composition to be about half ice and half rock. Umbriel [ http://bang.lanl.go…] is the fourth largest and third most distant of Uranus' five large moons. Umbriel was discovered in 1851 by William Lassell [ http://www.ast.cam.…]. Explanation
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Credit and Copyright:
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Credit_and_Copyright
Credit and Copyright
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facet_when:
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1851
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1851
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January 1986
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January 1986
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facet_where:
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Arizona
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Arizona
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facet_where:
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Uranus
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Uranus
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facet_where:
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Hamilton
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Hamilton
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facet_where:
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Ariel
facet_where
Ariel
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facet_where:
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Umbriel
facet_where
Umbriel
facet_where
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facet_where:
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Goddard Space Flight Center (GSFC)
facet_where
Goddard Space Flight Center (GSFC)
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facet_where:
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Jet Propulsion Laboratory (JPL)
facet_where
Jet Propulsion Laboratory (JPL)
facet_where
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facet_what:
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Voyager
facet_what
Voyager
facet_what
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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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Voyager 2
facet_what
Voyager 2
facet_what
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facet_what:
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Uranus
facet_what
Uranus
facet_what
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facet_what:
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Ariel
facet_what
Ariel
facet_what
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facet_what:
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Umbriel
facet_what
Umbriel
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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1986
facet_when_year
1986
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facet_when_year:
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1851
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1851
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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-ap960407
UID
SPD-APOD-ap960407
UID
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