A pair of Jupiter-sized planets has been put together from a surprisingly light mixture.
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References
Cochran W. D., Endl M., Wittenmyer R. A. & Bean J. L. Astrophys. J. (in the press).
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Ball, P. Two new planets lack heavy foundations. Nature (2007). https://doi.org/10.1038/news070604-4
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DOI: https://doi.org/10.1038/news070604-4