Stellar Motions of Halo Stars in Milky Way

This illustration shows the disc of our Milky Way galaxy, surrounded by a faint, extended halo of old stars. Astronomers using the Hubble Space Telescope to observe the nearby Andromeda galaxy serendipitously identified a dozen foreground stars in the Milky Way halo. They measured the first sideways motions (represented by the arrows) for such distant halo stars. The motions indicate the possible presence of a shell in the halo, which may have formed from the accretion of a dwarf galaxy. This observation supports the view that the Milky Way has undergone continuing growth and evolution over its lifetime by consuming smaller galaxies.


NASA, ESA, and A. Feild (STScI)

About the Image

NASA press release
NASA caption
Release date:22 February 2013, 11:16
Size:2400 x 1800 px

About the Object

Type:Milky Way

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