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News and Views
Nature 459, 650-651 (4 June 2009) | doi:10.1038/459650a; Published online 3 June 2009
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Cosmology: Climbing up the cosmic ladder
Ofer Lahav1
Abstract
Study of an under-appreciated subclass of stars that brighten and dim periodically brings to light their potential use as cosmic yardsticks — out to distances of a few hundred million light years.
What is the expansion rate of the Universe? And how old is the Universe?
- Ofer Lahav is in the Department of Physics and Astronomy, University College London, London WC1E 6BT, UK.
Email: lahav@star.ucl.ac.uk
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