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giant starNewsweek
•77% Informative
8 Ursae Minoris b or Halla was discovered in 2015 , 520 light years from our solar system.
The planet's star, Baekdu ( 8 UMi), is thought to have expanded out to around 150 percent the size of Halla 's orbit as it grew into a red giant, before collapsing back down to its current size.
Previous theories as to how Halla survived suggested that 8UMi was once two lower-mass stars that combined as one red giant.
However, a new study in The Astrophysical Journal Letters has found something that has reopened the mystery.
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