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What Is A Star's 'Proper Motion?'

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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:

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Bonnie North
Bonnie joined WUWM in March 2006 as the Arts Producer of the locally produced weekday magazine program Lake Effect.
Dr. Jean Creighton has always been inspired by how the cosmos works. She was born in Toronto, Ontario and grew up in Athens, Greece where her mother claims she showed a great interest in how stars form from the age of five.