Which of the following are signposts of the presence of high mass stars, and thus recent star formation?
A) closely spaced low mass stars
B) predominantly blue reflection nebulae
C) predominantly red ionization nebulae
D) A and C
E) B and C
E
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If the spiral density wave were the only thing producing spiral arms, it would be expected that
a. all spiral arms would be gas and dust free. b. all galaxies would have only two smooth spiral arms. c. the Milky Way would show and irregular pattern of short arms d. the Milky Way wouldn't have any spiral arms. e. the halo component of the Milky Way would show spiral arms as well.
A 30.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the frequency of the second mode?
A. 900 Hz B. 827 Hz C. 750 Hz D. 721 Hz E. 650 Hz
The ________ magnitude of a star depends directly upon its luminosity and distance
Fill in the blank(s) with correct word
What kinds of objects lie in the disk of our galaxy?
A) open clusters B) O and B stars C) old K and M stars D) gas and dust E) all of the above