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Science 6 January 2006:
Vol. 311. no. 5757, pp. 44 - 45
DOI: 10.1126/science.1122556
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Perspectives

ASTRONOMY:
Triangulating the Galaxy

James J. Binney

Measurements of a maser in the Milky Way allow precise determination of astronomical distances and should improve estimates of the fraction of dark matter in the galaxy.

The author is at the Rudolf Peierls Centre for Theoretical Physics, Oxford University, Oxford OX1 3NP, UK. E-mail: binney{at}thphys.ox.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)