File:Stephan's Quintet (NGC 7317, NGC 7318A, NGC 7318B, NGC 7319, NGC 7320) (noao-02347).jpg
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DescriptionStephan's Quintet (NGC 7317, NGC 7318A, NGC 7318B, NGC 7319, NGC 7320) (noao-02347).jpg |
English: Stephan's Quintet, as its name implies, is a group of five galaxies (NGC7317, 7318A, 7318B, 7319 and 7320) in the constellation Pegasus. This unusual system has often been used as proof that the redshift is not truly a distance indicator, which would completely overturn current cosmology, because although four of the galaxies have similar, large redshifts, the fifth (NGC7320), although apparently a member of the group, shows a much smaller redshift. Conventional theory states that the low-redshift galaxy is in a nearby group (the NGC7331 group) and by coincidence appears on the sky projected against a distant background group. Opponents point to debris and tails around the low-redshift galaxy, suggesting that it is interacting with the high-redshift systems, which would require that all five galaxies be at the same physical location in space. See also our color picture from the 0.9-meter. |
Date | 30 June 2020, 21:34:00 (upload date) |
Source | Stephan's Quintet (NGC 7317, NGC 7318A, NGC 7318B, NGC 7319, NGC 7320) |
Author | NOIRLab/NSF/AURA |
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Credit/Provider | NOIRLab/NSF/AURA |
Source | NSF's NOIRLab |
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Date and time of data generation | 21:34, 30 June 2020 |
JPEG file comment | stephans quintet, a group of galaxies in pagasus. ngc7317, ngc7318a, ngc7318b, ngc7319, ngc7320. kpno 4m 1975 north is at the top. catalog no. 2302 |
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Contact information |
950 North Cherry Ave. Tucson, AZ, 85719 USA |
IIM version | 4 |