The proper motion of a star is its change in position from year to year relative to the Solar System. This is in contrast to its apparent motion over the course of a night, caused by Earth’s rotation, and over the course of a year, caused by Earth’s orbit around the Sun. Edmund Halley’s discovery of proper motion three centuries ago required comparing observations in the late 1600s to observations made more than 1,800 years earlier. Today, we can use powerful space- and ground-based telescopes t
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