Why are HII regions red in color?
A) They contain considerable quantities of dust
B) They emit hydrogen emission lines
C) They are moving away from us at high speed
D) Twenty-one cm photons are red in color
Correct Answer:
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Q6: We cannot see the other side of
Q7: What property of globular clusters made it
Q8: Interstellar dust grains produce
A)Radio emission at a
Q9: The 21 cm line is emitted by
A)Hydrogen
Q10: The hydrogen in an HII region is
A)In
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
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