Mysterious 'zombie planet' Halla seems to have survived the explosive death of its star. How?
Astronomers have discovered a Jupiter-size planet that"shouldn't exist" after the sudden and violent expansion of its host star.
Related: A 'captured' alien planet may be hiding at the edge of our solar system — and it's not 'Planet X' Halla was first discovered by Korean astronomers in 2015, using a technique known as the radial velocity method, which searches for the tugs of hidden planets in the wobbling of distant stars. Yet Halla presented a mystery: It was orbiting the star Baekdu , which had already transformed into a red giant.
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