Watching stars “wobble” is a tried-and-true method astronomers use to find huge planets lurking in the outer reaches of the cosmos. If a planet is big enough, its gravity tugs on its parent star just enough that we can see the faint changes in starlight. Using this method, a team of astronomers watched the star HR 5183 with three telescopes for 20 years and found a massive planet, around three times the mass of Jupiter, spinning around it on a highly unusual, egg-shaped orbit.
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