Click the link for more information. that indicated the great distances at which this and other galaxies are located. Wilson Observatory, Pasadena, Calif., of which he became director.
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He did research (1914–17) at Yerkes Observatory, and joined (1919) the staff of Mt.
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Hubble Hubble, Edwin Powell,ġ889–1953, American astronomer, b. Click the link for more information. (1926–29) by Edwin P. It is also known as the Great Nebula in Andromeda. Click the link for more information. came from a study of the Andromeda Galaxy Andromeda Galaxy,Ĭataloged as M31 and NGC 224, the closest large galaxy to the Milky Way and the only one visible to the naked eye in the Northern Hemisphere. The galaxy of which the sun and solar system are a part, seen as a broad band of light arching across the night sky from horizon to horizon if not blocked by the horizon, it would be seen as a circle around the entire sky. Recognition that galaxies are independent star systems outside the Milky Way Milky Way, Click the link for more information., typically containing billions of stars. Material that is believed to make up nearly 27% of the mass of the universe but is not readily visible because it neither emits nor reflects electromagnetic radiation, such as light or radio signals. Click the link for more information., gas, dust, and usually dark matter dark matter, Hot incandescent sphere of gas, held together by its own gravitation, and emitting light and other forms of electromagnetic radiation whose ultimate source is nuclear energy.