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Is it possible that the gravitational effects attributed to dark matter could be caused by Jupiter-sized planets discovered orbiting other stars and also floating freely outside planetary systems? | Astronomy.com

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Is it possible that the gravitational effects attributed to dark matter could be caused by Jupiter-sized planets discovered orbiting other stars and also floating freely outside planetary systems?

FROM THE August 2012 ISSUE

Is it possible that the gravitational effects attributed to dark matter could be caused by Jupiter-sized planets discovered orbiting other stars and also floating freely outside planetary systems?

Martin J. Grumet, Boise, Idaho

Published: Monday, June 25, 2012

A large number of detected and undetected Jupiter-sized planets could not mimic the gravitational effects produced by dark matter for two reasons. First, planets, although faint, are made of luminous matter and therefore are ultimately detectable. Second, their estimated numbers and locations, primarily around the galactic plane, do not support the large-scale gravitational effects similar to those of dark matter.

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