New analyses cut down the estimated number of planets unattached to a star by half.
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References
Sumi, T. et al. Nature 473, 349-352 (2011).
Clanton, C. & Gaudi, B. S. Astrophys. J. 834, 46 (2017).
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Skibba, R. The hunt for rogue planets just got tougher. Nature (2017). https://doi.org/10.1038/nature.2017.21445
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DOI: https://doi.org/10.1038/nature.2017.21445