tip of the red giant branch

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deinonychus "Tip of the red giant branch (TRGB) is a primary distance indicator used in astronomy. It uses the luminosity of the brightest red giant branch stars in a galaxy to gauge the distance to that galaxy. It has been used in conjunction with observations from the Hubble Space Telescope to determine the relative motions of the Local Cluster of galaxies within the Local Supercluster." (Wikipedia) May 10, 2012

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‘tip of the red giant branch’ has been looked up 84 times, added to 1 list, commented on 1 time, and is not a valid Scrabble word.