Which of the following features of a telescope determines its light-gathering power?
A) The magnifying power of the objective
B) The diameter of the primary mirror
C) The focal length of the eyepiece
D) The length of the telescope tube
B
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__________is a graph of orbital velocity versus radius in the disk of a galaxy
A) A rotation curve B) A normal distribution C) The H-R diagram D) The light curve
In this experiment, what is the maximum possible error in degrees that could be made in deter mining the Moon's altitude by assuming the Moon traveled in the same plane as the ecliptic?
In a Compton scattering experiment, the scattered photon has a wavelength of 6.55 pm. If the scattering angle is 
what is the wavelength of the incident photon?
A. 5.68 pm B. 7.42 pm C. 3.28 pm D. 0.868 pm E. 2.43 pm
The instruments of the Mars Odyssey spacecraft detected water frozen in the soil over large areas of Mars
a. True b. False Indicate whether the statement is true or false