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Nature 440, 1002-1003 (20 April 2006) | doi:10.1038/4401002a; Published online 19 April 2006
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Astronomy: Trouble at first light
Piero Madau1
Abstract
The question of how much light the first stars produced is fundamental to models of the Universe's development. But observations have so far failed to agree: is the answer a lot, or not very much at all?
On page 1018 of this issue, Aharonian et al.1 report the detection of copious high-energy 
-ray emission from two 'blazars' — a class of active galaxy — around 2 billion light years from Earth. This observation indicates that such radiation can travel largely unimpeded through the cosmos, and implies that the infrared glow of the first stars in the Universe and their remnants is fainter than previous measurements had led us to believe.
- Piero Madau is in the Department of Astronomy and Astrophysics, University of California, Santa Cruz, California 95064, USA.
Email: pmadau@ucolick.org
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A low level of extragalactic background light as revealed by γ-rays from blazarsNature Letters to Editor (20 Apr 2006)
