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Extrasolar planets

With a coarse-tooth comb

The search for Earth-like planets outside our Solar System is bedevilled by the lack of an adequate frequency standard for calibrating starlight. Tweaking existing laser 'frequency combs' could be a way forward.

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Figure 1: Shifting stars.


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Walker, G. With a coarse-tooth comb. Nature 452, 538–539 (2008).

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