The light-gathering power of a telescope is directly proportional to the:
A) square of the diameter of the primary mirror or lens.
B) cube of the diameter of the primary mirror or lens.
C) square of the focal length of the primary mirror or lens.
D) cube of the radius of curvature of the primary mirror or lens.
A
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Protostars can be observed in
A) the Crab Nebula. B) the Andromeda Galaxy. C) the Orion Nebula. D) our Solar System. E) the Helix Nebula.
A 4.00 kg mass is connected to a spring with a spring constant of 9.00 N/m. The velocity is given by the expression v(t) = 8.00 cm/s sin
What is the maximum acceleration of the simple harmonic motion?
A. 10.0 
B. 16.2
C. 19.2
D. 20.2
E. 24.5
B-type stars have lifetimes
A) long enough for advanced life to evolve B) too short for planet formation C) long enough for planets to form but not for life to appear D) long enough for planets to form and for simple life to appear, but not long enough for advanced life to develop
When spiral nebulae were first discovered, astronomers quickly identified them as distant groupings of stars
a. True b. False Indicate whether the statement is true or false