Astronomers have pinpointed the black hole at the centre of the Milky Way with more accuracy than ever before. Andrea Ghez and co-workers at the University of California at Los Angeles observed three stars orbiting the radio source known as Sagittarius A*. Astronomers have long suspected that Sagittarius A* is the black hole at the centre of our galaxy, and the new measurements are the strongest evidence yet to support the theory (A M Ghez et al 2000 Nature 407 349).
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