Portent | Cool, Fun Stuff
Sep
27
Posted on 27-09-2007
Since I was a kid, I’ve always loved the thought of space and the vast empty spaces between planets and galaxies.
This image shows a map of our Universe with galaxies colour coded to indicate their red shift. The red shift is a manifestation of the Doppler Effect- when a car moves away from you, if you hear its horn, the frequency of the horn drops as it gets further away. The horn’s frequency hasn’t actually changed, just that the sound has further to travel and so sounds lower. The light from an object moving away lowers frequency towards the red end of the spectrum; that’s the red shift.
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