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galactic halo |
Also found in: Wikipedia, Hutchinson | 0.02 sec. |
galactic haloIn astronomy, a nearly spherical volume of thinly scattered stars, globular clusters, and tenuous gas observed surrounding spiral galaxies. It may extend far beyond the disk and contain most of the galaxy's mass. The halo of the Milky Way Galaxy is thought to have a radius greater than 100,000 light-years and to be predominantly composed of dark matter. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The relative youth of many of Andromeda's halo stars suggests that an intruder crashed into the galaxy some 8 billion years ago, hurling young stars from Andromeda's central disk into the halo. Already studying a larger catalog of halo stars, Timothy C. In a new study analyzing highly accurate measurements of the position and velocity of 41 halo stars near the sun, B. |
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