A star has a parallax of 0.08 arc seconds. What is its distance?
A. 8 light-years
B. 80 parsecs
C. 12.5 parsecs
D. 125 parsecs
E. 8 parsecs
Answer: C
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Mercury's major atmospheric gas is
a. oxygen. b. hydrogen. c. carbon dioxide. d. Misleading; the atmosphere is virtually nonexistent.
Stephen Hawking predicted that black holes can "evaporate" by emitting what we now call Hawking radiation. What does it mean for a black hole to "evaporate"?
A) The black hole loses its electric charge. B) The black hole's mass is gradually reduced. C) The black hole itself remains unchanged in mass, but it is able to send radiation out into the universe. D) Any matter that surrounds the black hole is heated to the point where it becomes a gas, if it wasn't already.
The huge lobe radio galaxy at the center of the Virgo Supercluster is:
A) Virgo X-1. B) M-87, a giant elliptical galaxy. C) M-74, a very bright Seyfert Spiral. D) M-82, disturbed by the passage of M-81 nearby. E) the Large Magellanic Cloud, disturbed by Supernova 1987A.
Wave speed and wave frequency are two terms that are
A) basically the same. B) fundamentally different from each other. C) opposites. D) reciprocals.