What are variable stars?

1 Answer
Pro
Jul 9, 2016

Variable stars are those stars whose brightness as seen from the earth fluctuates.

Explanation:

These variations are caused by something blocking the light or by change in emission of light from the stars.This may be caused by some revoluting companion of the star or by swelling or shrinking of the star.

Related questions
Impact of this question
678 views around the world
You can reuse this answer
Creative Commons License