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galactic halo
(redirected from Halo star)

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galactic halo
n
(Astronomy) Astronomy a spheroidal aggregation of globular clusters, individual stars, dust, and gas that surrounds the Galaxy
galactic halo
A large, spherical region of relatively dust-free space surrounding a spiral galaxy such as the Milky Way. The inner regions of the galactic halo contain globular clusters of very old stars, while the outer regions are apparently occupied by large amounts of dark matter. See also MACHO.
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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.
Image reveals galaxy's violent past. (Starry View) by Cowen, R. / Science News
Already studying a larger catalog of halo stars, Timothy C.
Star streams reveal galaxy's dining habits by Cowen, R. / Science News
In a new study analyzing highly accurate measurements of the position and velocity of 41 halo stars near the sun, B.
Hipparcos finds hint of star streams by Cowen, R. / Science News
 
 
 
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