By looking for changes in this pulsing of the star, Dr Silvotti deduced that a planet was orbiting it. Moreover, he was able to measure the tiny delays in the arrival of its pulses that were caused by the planet whipping around it, tugging it to and fro. From these minuscule shifts, the team estimated that the planet is about three times the mass of Jupiter, and orbits its star at a distance slightly greater than that between Mars and the sun.
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