The Realm of the Nebulae

In less than a century, the accepted picture of the universe transformed from a stagnant place, comprised entirely of our own Milky Way galaxy, to a realm inhabited by billions of individual galaxies, hurtling away from one another. We must thank, in part, Edwin P. Hubble - one of the greatest obser [...]
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In less than a century, the accepted picture of the universe transformed from a stagnant place, comprised entirely of our own Milky Way galaxy, to a realm inhabited by billions of individual galaxies, hurtling away from one another. We must thank, in part, Edwin P. Hubble - one of the greatest observational astronomers of the 20th century. In 1936, Hubble described his principal observations and conclusions in "The Realm of the Nebulae", which quickly became a classic work. Two new introductory pieces, by Robert P. Kirshner and Sean M. Carroll, explain advances since Hubble's time and his work's foundational importance.