Researchers published a paper last month, exploring the possibility that our sun might have once had a stellar twin! Could our solar system have once been a binary, or even a multi-star system?
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Sources:
https://arxiv.org/abs/1705.00049
http://adsabs.harvard.edu/abs/1991A%26A…248..485D
http://www.astrophysicsspectator.com/topics/stars/BinaryStars.html
https://arxiv.org/abs/1308.6328v1
https://courses.lumenlearning.com/astronomy/chapter/measuring-stellar-masses/
https://starchild.gsfc.nasa.gov/docs/StarChild/questions/question62.html
https://www.space.com/22538-nemesis-star.html
http://www.atnf.csiro.au/outreach/education/senior/astrophysics/binary_intro.html
http://www.atnf.csiro.au/outreach/education/senior/astrophysics/binary_mass.html
http://www.ifa.hawaii.edu/info/press-releases/WideBinaryStars/
http://iopscience.iop.org/article/10.1088/0004-637X/781/1/4/
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