The binary star system is made up of a normal star and a dense stellar remnant called a white dwarf. According to the new measurement, the star system is 372 light-years from Earth, not 520 light-years as previously thought. Known as SS Cygni, the star pair is one of themost often observed in the sky, but until now, astronomers couldn't figure out why it behaves the way it does.
SS Cygni erupts in regular outbursts about once every 49 days, when it brightens to release significantly more light than normal. Such outbursts are considered normal for most star pairs of this type, called dwarf novas, but if SS Cygni was as far away as astronomers thought, this explanation didn't make sense. []
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