How do scientists determine if a star is moving towards or away from Earth?
The luminosity formula- if you know an objects luminosity and the flux that we receive, we can calculate how far away it is. The principle is that if we see a star to be so bright, and we know how bright it really is, we can work out how far away it is to make it appear the brightness that it does; whether its a dim nearby star, or a far-away bright star. ChaCha!
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