We have precisely one data point against which to measure exoplanets for habitability: Earth. As far as we know, life has evolved only on this one pale blue dot, orbiting a single star in the middle of a spiral arm of an otherwise unremarkable galaxy.
Most stars in the Milky Way, however, are not like the Sun, hanging around in space all alone. Instead, up to 85 percent of stars may have at least one companion locked in mutual orbit (so it’s nice that the Sun has us to keep it company).
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