Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN: 9780134746241
Author: Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher: PEARSON
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Question
The Earth formed at a redshift of 0.49. That means that when our world was young, the universe was quite a bit smaller than it is today. The nearest galaxies to our own lie at a distance of around 1 Mpc from us (Mega-parsecs), and have luminosities of around  10^37W. Back when the Earth was young, however, they would have appeared closer. If we assume that the nearest galaxies are just being carried along by the expansion of the universe (actually not true for the nearest galaxies), then how far from us would they have been when the Earth was young (in Mpc)?
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