Skywatch

  • April 13, 2006

    Episode 31: Galactic Twins

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    Our Milky Way galaxy and one of our closest galactic neighbors, the Andromeda galaxy, appear to have had similar beginnings, and even evolved in similar ways over the first billion years of their lives. Astronomers found evidence of this when they recently used Hawaii's Keck Telescope to survey stars in Andromeda's halo, the fainter corona of stars and gas that extends well beyond the brighter visible familiar in photos.