Our Galaxy may be full of worlds without a sun to call their own.
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References
The Microlensing Observations in Astrophysics (MOA) Collaboration & The Optical Gravitational Lensing Experiment (OGLE) Collaboration. Nature 473, 349-352 (2011).
Stevenson, D. J. Nature 400, 32 (1999).
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Drake, N. So many lonely planets with no star to guide them. Nature (2011). https://doi.org/10.1038/news.2011.303
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DOI: https://doi.org/10.1038/news.2011.303