16May
By: Astroathens On: May 16, 2017 In: Astronomy Comments: 0

Redshift aka MOVING AWAY Blueshift aka MOVING CLOSER Also known as the Doppler effect It’s name comes from physicist Christian Doppler who first recognized the change in sound waves when moving closer or further in 1842. It was tested by Buys Ballot in 1845 by using a group of...

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30Dec
By: Astroathens On: December 30, 2016 In: Astronomy Comments: 0