Which source generates the most energy over its lifetime?
A) A supernova.
B) A gamma-ray burst.
C) A quasar.
D) The Sun.
E) A camp fire.
Ans: C) A quasar.
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Why do we sometimes observe asteroids at the distances of the gaps in the asteroid belt?
A) Jupiter's gravitational tugs keep them there. B) They are held in place by resonances with other asteroids. C) Actually, we never see asteroids in the gaps. D) They are kept in place by shepherding asteroids. E) A gap is located at an average orbital distance, and asteroid orbits often have large eccentricities.
What is the equivalent resistance between points A and B in the figure when R = 18 ??
a.
48 ?
b.
64 ?
c.
80 ?
d.
96 ?
e.
110 ?
The rapid rotation in the outer disk suggests that our galaxy is more massive than previously thought
a. True b. False Indicate whether the statement is true or false
At approximately what time does the third quarter Moon rise?
a) 9pm b) 6pm c) noon d) 6am e) midnight