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Observation data
Constellation Hercules
Right ascension 16h 44m 48.3s
Declination +46° 27′ 08.2″
Redshift 3.035
Distance 11.4 Gly
Apparent magnitude (V) 22.6
Type Galaxy merger
Other designations
PC 1643+4631A-2377
See also: Galaxy, List of galaxies

LBG-2377 is the most distant galaxy merger ever discovered, at a distance of 11.4 billion light years.[1] This galaxy merger is so distant that the universe was in its infancy when its light was emitted. It is expected that this galaxy proto-cluster will merge to form a brightest cluster galaxy, and become the core of a larger galaxy cluster.


Observations were conducted with the Keck Telescope in Hawaii by Jeff Cooke, a McCue Postdoctoral Fellow in physics and astronomy at UCI. While looking for single galaxies, Cooke found something that at first appeared like a bright, single object. However, further analysis of wavelengths of the emitted light proved that they were three galaxies merging, and likely two smaller galaxies.

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