A nova star is like a vampire that siphons gas from its binary partner. As it does so, the gas is compressed and heated, and eventually it explodes. The remnant gas shell from that explosion expands outward and is lit up by the stars at the center of it all. Most of these novae explode about once every 10 years.But now astrophysicists have discovered one remnant so large that the star that created it must have been erupting yearly for millions of years.The team of astrophysicist published their findings in a letter in the journal Nature.

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