Topic: Dark matter lens used to measure age of universe

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Astronomers from the United States and Europe have used a gravitational lens -- a distant, light-bending clump of dark matter -- to make a new estimate of the Hubble constant, which determines the size and age of the universe.

A paper describing the work appears in the March issue of The Astrophysical Journal.

 This image taken by the Hubble Space Telescope shows gravitational lens B1608. The objects A, B, C and D are all images of the same background object, distorted by the lens. G1 and G2 are two galaxies within the lens itself.[/span][/b]