Ultra-close stars discovered inside a planetary nebula

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Astronomers have discovered two stars in a binary pair that complete an orbit around each other in a little over three hours, residing in the planetary nebula M3-1. Remarkably, the stars could drive a nova explosion, an entirely unexpected event based on our current understanding of binary star evolution.

from Latest Science News -- ScienceDaily https://ift.tt/2yZJDLc

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