Question

The change in the colour of stars is linked to

Options

• Variation in their surface temperature

• Variation in their distance from the earth

• Fluctuations in their composition and size

• Irregular absorption or scattering in the earth's atmosphere

Answer 1

Irregular absorption or scattering in the earth's atmosphere

Explanation:
This is because of scintillation ("Twinkling") as the light passes through the atmosphere of the Earth. As the air moves in and out, the starlight is refracted,  often different colors in different directions. Because of this "chromatic aberration," stars can appear to change colors when they are twinkling strongly.