A reflection nebula is produced when the light from a star is scattered by interstellar
A) Electrons
B) Atoms
C) Molecules
D) Dust particles
Correct Answer:
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Q12: What kind of object creates an evacuated,very
Q13: What assumption about globular clusters did Harlow
Q14: What effect do interstellar dust particles have
Q15: The bluish color of the nebulosity around
Q16: What atom produces 21 cm radiation?
A)Hydrogen
B)Nitrogen
C)Silicon
D)Oxygen
Q18: Astronomers of about the year 1900 didn't
Q19: What keeps the matter in an HII
Q20: Why has the 21 cm emission line
Q21: How do we know that the Milky
Q22: Which of the following kinds of objects
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