News of the WeekAstronomy

Hubble Snaps Some Moving MACHOs

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Science  10 Sep 1999:
Vol. 285, Issue 5434, pp. 1653
DOI: 10.1126/science.285.5434.1653

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Summary

A team of astronomers believe they have captured on camera five candidate MACHOs (massive compact halo objects)--hypothetical objects that might make up the invisible "dark matter" pulling on the galaxy's visible stars. By comparing two Hubble Space Telescope images that probe the distant universe, the team found the five objects moving very slightly in the foreground. The team believes the objects may be old white dwarf stars--dim, burned-out stars--in the galaxy's halo.