Seth Shostak Quotes
Recent results from astronomers who study the occasional gravitational lensing of unknown worlds by intervening stars suggest that orphan planets could be at least as numerous as the stars. In other words, there could be hundreds of billions of orphan worlds shuffling through our galaxy.
Citations
Shostak, Seth. "Billions of Lonely 'Orphan' Planets Prowl the Milky Way." Space.com, Future US, 24 May 2011.
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Seth Shostak is an American astronomer and author, and is currently the senior astronomer for the SETI Institute.