What Is A Star's 'Proper Motion?'

Apr 25, 2019

Whether it's an accelerating car, a person biking or a thrown object, most motion is visible to the human eye. However, even at rest we all are in motion - at least on a cosmic scale.

Lake Effect's Bonnie North and astronomy contributor Jean Creighton started a conversation last month about celestial motion, and Creighton picks up the story by explaining another kind of motion - proper motion: