Which of the following correctly describes the meridian in your sky?
a) The full circle on any sphere that divides day and night
b)the point directly over your head
c) a half-circle extending to your horizon due north
a half-circle extending to your horizon due north
a half-circle extending to your horizon due north
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If the redshifts of quasars arise from the expansion of the universe yet they have brighter magnitudes than galaxies with the same redshifts, the quasar must
a. be very small. b. be within the Local Group. c. be a single star with an extremely large mass. d. be moving toward Earth with a large radial velocity. e. emit a very large amount of energy per second.
If you see a bright "star" in the sky, how could you tell whether it is a star or a planet?
A. Look at it several days later-if it's a planet, it will move across the background stars. B. Planets are round; stars have five points. C. Planets are too dim to be seen without a telescope. D. Planets always appear right next to the Moon.
Suppose you put a chocolate layer on pieces of candy. Compared with the amount of chocolate used to cover 1 pound of large pieces, if you cover 1 pound of smaller pieces you'll use
A) less chocolate. B) the same amount of chocolate. C) more chocolate. D) makes no difference
On an H-R diagram, a protostar would be:
A) above and to the right of the main sequence. B) below and to the left of the main sequence. C) below and near the right side of the main sequence. D) above and near the upper left of the main sequence. E) on the main sequence at the extreme lower right.