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Collection:
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NASA Great Images in Nasa Collection
Collection
NASA Great Images in Nasa Collection
Collection
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Title:
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Ring Around a Galaxy
Title
Ring Around a Galaxy
Title
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Full Description:
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Space Telescope Science Institute astronomers are giving the public chances to decide where to aim NASA's Hubble Space Telescope. Guided by 8,000 Internet voters, Hubble has already been used to take a close-up, multi-color picture of the most popular object from a list of candidates, the extraordinary "polar-ring" galaxy NGC 4650A. Located about 130 million light-years away, NGC 4650A is one of only 100 known polar-ring galaxies. Their unusual disk-ring structure is not yet understood fully. One possibility is that polar rings are the remnants of colossal collisions between two galaxies sometime in the distant past, probably at least 1 billion years ago. What is left of one galaxy has become the rotating inner disk of old red stars in the center. Meanwhile, another smaller galaxy which ventured too close was probably severely damaged or destroyed. The bright bluish clumps, which are especially prominent in the outer parts of the ring, are regions containing luminous young stars, examples of stellar rebirth from the remnants of an ancient galactic disaster. The polar ring appears to be highly distorted. No regular spiral pattern stands out in the main part of the ring, and the presence of young stars below the main ring on one side and above on the other shows that the ring is warped and does not lie in one plane. Determining the typical ages of the stars in the polar ring is an initial goal of our Polar Ring Science Team that can provide a clue to the evolution of this unusual galaxy. The HST exposures were acquired by the Hubble Heritage Team, consisting of Keith Noll, Howard Bond, Carol Christian, Jayanne English, Lisa Frattare, Forrest Hamilton, Anne Kinney and Zolt Levay, and guest collaborators Jay Gallagher (University of Wisconsin-Madison), Lynn Matthews (National Radio Astronomy Observatory-Charlott esville), and Linda Sparke (University of Wisconsin-Madison).
Full_Description
Space Telescope Science Institute astronomers are giving the public chances to decide where to aim NASA's Hubble Space Telescope. Guided by 8,000 Internet voters, Hubble has already been used to take a close-up, multi-color picture of the most popular object from a list of candidates, the extraordinary "polar-ring" galaxy NGC 4650A. Located about 130 million light-years away, NGC 4650A is one of only 100 known polar-ring galaxies. Their unusual disk-ring structure is not yet understood fully. One possibility is that polar rings are the remnants of colossal collisions between two galaxies sometime in the distant past, probably at least 1 billion years ago. What is left of one galaxy has become the rotating inner disk of old red stars in the center. Meanwhile, another smaller galaxy which ventured too close was probably severely damaged or destroyed. The bright bluish clumps, which are especially prominent in the outer parts of the ring, are regions containing luminous young stars, examples of stellar rebirth from the remnants of an ancient galactic disaster. The polar ring appears to be highly distorted. No regular spiral pattern stands out in the main part of the ring, and the presence of young stars below the main ring on one side and above on the other shows that the ring is warped and does not lie in one plane. Determining the typical ages of the stars in the polar ring is an initial goal of our Polar Ring Science Team that can provide a clue to the evolution of this unusual galaxy. The HST exposures were acquired by the Hubble Heritage Team, consisting of Keith Noll, Howard Bond, Carol Christian, Jayanne English, Lisa Frattare, Forrest Hamilton, Anne Kinney and Zolt Levay, and guest collaborators Jay Gallagher (University of Wisconsin-Madison), Lynn Matthews (National Radio Astronomy Observatory-Charlott esville), and Linda Sparke (University of Wisconsin-Madison).
Full Description
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Date:
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05/06/1999
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NASA Center:
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Hubble Space Telescope Center
NASA_Center
Hubble Space Telescope Center
NASA Center
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Subject Category:
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Deep Space Studies
Subject_Category
Deep Space Studies
Subject Category
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Subject Category:
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Hubble
Subject_Category
Hubble
Subject Category
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Keywords:
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Space
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Keywords:
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Field
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Keywords:
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Camera
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Keywords:
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Telescope
Keywords
Telescope
Keywords
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Keywords:
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Wide
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Keywords:
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Planetary
Keywords
Planetary
Keywords
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Keywords:
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Hubble
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Keywords:
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HST
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Keywords:
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Nebula
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Keywords:
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WFPC
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Keywords:
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NG
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Keywords:
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4650A
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Keywords:
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Dark-Matter
Keywords
Dark-Matter
Keywords
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Audience:
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General Public
Audience
General Public
Audience
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facet_what:
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Polar
facet_what
Polar
facet_what
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facet_what:
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Aura
facet_what
Aura
facet_what
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facet_what:
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Hubble Space Telescope (HST)
facet_what
Hubble Space Telescope (HST)
facet_what
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facet_where:
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Hamilton
facet_where
Hamilton
facet_where
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facet_where:
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Madison
facet_where
Madison
facet_where
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facet_where:
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Wisconsin
facet_where
Wisconsin
facet_where
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facet_when:
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05-06-1999
facet_when
05-06-1999
facet_when
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facet_when_year:
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1999
facet_when_year
1999
facet_when_year
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Image #:
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PR99-16
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original_url:
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original_url
original_url
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UID:
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SPD-GRIN-GPN-2000-00 0944
UID
SPD-GRIN-GPN-2000-00 0944
UID
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Center:
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HSTI
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Center Number:
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PR99-16
Center_Number
PR99-16
Center Number
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GRIN DataBase Number:
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GPN-2000-000944
GRIN_DataBase_Number
GPN-2000-000944
GRIN DataBase Number
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Creator-Photographer:
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NASA, The Hubble Heritage Team, STScI, AURA ODRing Around a Galaxy
Creator-Photographer
NASA, The Hubble Heritage Team, STScI, AURA ODRing Around a Galaxy
Creator-Photographer
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Original Source:
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DIGITAL
Original_Source
DIGITAL
Original Source
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