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MACHO

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

MACHO Abbr. for massive compact halo object, a hypothetical object presumed to exist in the halo of galaxies, including our own. MACHOs are invisible but they make a significant contribution to the overall mass of a galaxy; they are therefore a form of dark matter. MACHOs could be low-luminosity stars, Jupiter-like planets, or black holes. Observed microlensing of stars in the Large Magellanic Cloud could be due to MACHOs around our Galaxy. See also Wimp.

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"MACHO." A Dictionary of Astronomy. 1997. Encyclopedia.com. 1 Dec. 2009 <http://www.encyclopedia.com>.

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