Interstellar dust grains produce
A) Radio emission at a wavelength of 21 cm
B) Interstellar absorption lines in the spectra of distant stars
C) Extinction and reddening of the light from distant stars
D) Ultraviolet radiation responsible for HII regions
Correct Answer:
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Q3: What kind of star is located at
Q4: The distance to the center of the
Q5: The distance to the center of our
Q6: We cannot see the other side of
Q7: What property of globular clusters made it
Q9: The 21 cm line is emitted by
A)Hydrogen
Q10: The hydrogen in an HII region is
A)In
Q11: Why are HII regions red in color?
A)They
Q12: What kind of object creates an evacuated,very
Q13: What assumption about globular clusters did Harlow
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