If the theory that novae occur in close binary systems is correct, then novae should
a. produce synchrotron radiation.
b. occur in regions of star formation.
c. not occur in old star clusters.
d. all be visual binaries.
e. repeat after some interval.
E
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CCD stands for a
a. photometer. b. charge-coupled device. c. spectrograph. d. core collapse device. e. grating.
What is the density-wave model?
A. It is a model who puts on a show at astronomy meetings. B. It is a description of how light propagates. C. It is a theory of the origin of the Universe. D. It is a way of describing the formation of Galactic spiral arms.
Stars originate as large bodies of slowly rotating gas. Because of gravity, these clumps of gas slowly decrease in size. The angular velocity of a star increases as it shrinks because of
A. conservation of angular momentum B. conservation of linear momentum C. conservation of energy D. the law of universal gravitation E. conservation of mass
Suppose that an object is moving with constant acceleration. Which of the following is an accurate statement concerning its motion?
A) In equal times its speed changes by equal amounts. B) In equal times its velocity changes by equal amounts. C) In equal times it moves equal distances. D) The object is not moving; it is at rest. E) A statement cannot be made without additional information.