About which of the following, we can get an idea from the light coming from stars?

Options :
  1. Size of stars
  2. Rotational speed of stars
  3. Mass of stars
  4. Density of stars
Answer and Explanation :-

Answer: Option 2


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Are we alone? Over time, you will come up with various answers to that same nagging question. Eventually one day it will occur to you that this endless asking is the answer you have been looking for. The fact that we have an ongoing dialogue with the universe is proof enough that there is "something" out there.
-Veronique Vienne The Art of the Moment: Simple Ways to Get the Most from Life