Question

A star sometimes appears brighter and some other times fainter.what is the effect called ? State the reason for this effect

Answer 1

due to atmospheric refraction of their light. The continuously changing atmosphere is able to cause variations in the light coming from a point-sized star because of which the stars appears to be twinkling.

Answer 2

Explanation:

A star sometimes appear brighter and some other time fainter, this effect is called as twinkling effect.