Stars twinkle because – McqOptions

MCQOPTIONS

1.	Stars twinkle because
A.	the intensity of light emitted by them changes with time
B.	the distance of the stars from the earth changes with time
C.	the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time
D.	the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere
Answer» D. the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere

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