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How can gravity be used to find new planets?

April 26, 2017Astronomy gravity Mathematics planets Used

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How can gravity be used to find new planets?

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Gravity has been used to find extrasolar planets… It’s the only way (so far) that anyone has been able to detect them. The minute wobble a planet exerts upon its host star is recorded by Earth astronomers in redshift… The planets have been detected by a regularly periodic blue/red shift of the host star’s light, indicating that something (a planet) was in orbit.