Brown dwarfs have not been found in the halo of our Galaxy
Indicate whether the statement is true or false
False
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An optical SETI signal would most likely consist of
A) using mirrors to reflect light from the surface of a planet B) using a giant disk to block out the light from the parent star C) rapid, short bursts of intense laser light D) a continuous beam of laser light
Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the acceleration
of the first person to the acceleration 
of the second person. Which statement is correct?
a.
They are equal and opposite in direction.
b.
They are equal and have the same direction.
c.
The acceleration 
is greater than , but they have the same direction.
d.
The acceleration is greater than , but they have opposite directions.
e.
The acceleration >is less than , but they have the same direction.
A white dwarf star is prevented from collapsing by
a. nuclear energy it is generating. b. its gravitational force. c. Hubble's law of extragalactic redshifts. d. degenerate electron gas pressure. e. degenerate astronomers observing the star.
What is not true of Population I stars?
A. They are found in the disk. B. They are frequently blue. C. They are old. D. They are high heavy element content.