Why do some scientists propose that the Sun may have had a binary companion?
Answer
Because the Sun's solitary status is a statistical outlier compared to most stars
Most stars in the galaxy are formed in clusters and frequently in pairs, meaning the majority of stars are part of multiple-star configurations. The Sun's existence as a solitary star makes it a statistical anomaly. This has led to the hypothesis that the Sun may have been born with a sibling that was eventually separated due to gravitational interactions with passing stars in its original birth cluster.
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