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Exoplanet caught speeding

The masses of exoplanets have so far been inferred from the tiny gravitational pull they exert on the host stars. It is now possible to measure them from shifts in spectral lines arising from the planets' atmospheres.

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Figure 1: An exoplanet's Doppler signal.


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López-Morales, M. Exoplanet caught speeding. Nature 465, 1017–1018 (2010).

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