What method do scientists use to tell how far a galaxy is?

1 Answer
chandramohanPanakkal
May 29, 2018

standard candle.

Explanation:

If you know the brightness of a star and at what scale light reduces with distances we can calculate the distance,.Some variable stars have a relation between its luminosity and period.Example cephied delta. If you find a variable star like this in a galaxy we can use it as standard candle and calculate the distance. Type 1a supernova can also be used for this purpose. refer Wikipedia cosmic distance ladder.

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