Contrast the sizes of molecular clouds with emission nebulae.
What will be an ideal response?
Question 2In structure, our Milky Way is most similar to:
A) the Large Magellanic Cloud.
B) an upscale version of a globular cluster.
C) M-31, the Andromeda Galaxy.
D) the Orion nebula.
E) None of these.
Question 3The absorption lines for a cool thin gas are identical in color and energy to the emission lines of the same gas if hot enough to glow.
Indicate whether the statement is true or false
Question 4Which of the following is not a major reason why astronomers would like an observatory on the far side of the Moon?
A) Telescopes on the Moon could see objects in all parts of the sky equally well, whereas telescopes on Earth can see only portions of the sky that depend on their latitude.
B) Radio astronomy would be advantageous on the Moon because human radio transmissions are less likely to cause interference, especially on the far side of the Moon.
C) It would be possible to put telescopes for ultraviolet and X-ray astronomy on the surface, unlike the case on the surface of the Earth.
D) Telescopes on the Moon could observe stars even when it is daytime on the Moon.
Question 5Concerning dark energy, we do know:
A) that it is created when matter annihilates anti-matter.
B) its density remains constant over time, so it is not important in the early Universe.
C) combined with dark matter, it will ultimately produce a closed universe.
D) that it was revealed with Type II supernovae distances in the late 1990s.
E) that it makes up 90 of all the matter and energy in the whole universe.
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