What Causes Stars to Twinkle

question 53

Multiple Choice

What causes stars to twinkle?

• A)It is intrinsic to the stars-their brightness varies as they expand and contract.
• B)variations in the absorption of the atmosphere
• C)variable absorption by interstellar gas along the line of sight to the star
• D)bending of light rays by turbulent layers in the atmosphere
• E)the inability of the human eye to see faint objects

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