Parallax would be easier to measure if
a. Earth's orbit was larger.
b. the stars were farther away.
c. Earth moved faster along its orbit.
d. Earth's orbit was larger, the stars were further away, and Earth moved faster along its orbit.
e. None of the other choices are correct.
Question 2Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope
b. the VLBA telescope
c. an X-ray telescope
d. a radio telescope
e. None of the other choices are correct.
Question 3The hydrogen lines in spectral type A stars
a. are most narrow for supergiants.
b. are most narrow for main-sequence stars.
c. can not be used to estimate the luminosity of the star.
d. are very weak and difficult to see.
e. are useful in determining the apparent magnitude of the star.
Question 4The ____ of a telescope is a measure of its ability to show fine detail and depends on the diameter of the objective.
a. light-gathering power
b. focal length
c. magnifying power
d. resolving power
e. spherical aberration
Question 5Draw all zones and layers of the Sun from the interior through the atmospheres and beyond, if needed.
What will be an ideal response?
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