Halla is an exoplanet orbiting dying star Baekdu at a close distance, meaning it should have been engulfed by the star as it expanded into a red giant.
The planet is named 8 UMi b, or Halla, and is a Jupiter-like gas giant orbiting the red giant star at a distance around half that between the Earth and our sun. The study cites three possible theories why Halla hasn't been obliterated, one of which is straight out of Star Wars: Episode IV—A New Hope, released in 1977.
"A merger of these two stars may have prevented any one of them from expanding sufficiently large enough to engulf the planet." Stars stay alive through a balance between the massive gravity of its mass pressing inwards and the outwards push ofoccurring within, converting hydrogen to helium. As stars like our own sun die, they run out of hydrogen fuel, causing the core to collapse inwards, which raises the internal temperature of the star and ignites a shell of hydrogen burning around the core.
Stock image of a large red star and an exoplanet. Scientists have discovered a planet that has somehow survived the expansion of its star.In the paper, the authors theorize how Halla could have made its lucky escape.
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