Cosmic rays penetrate your body when
A) safely in your home.
B) outdoors.
C) in mountainous regions.
D) all of the above
E) none of the above
Answer: D
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A planetary nebula
a. produces an absorption spectrum. b. produces an emission spectrum. c. is contracting to form planets. d. is contracting to form a star. e. is the result of carbon detonation in a 1 Mo star.
The planet HAT-P-32b has more than twice the radius of Jupiter, yet is only the same mass. It orbits its star more than a factor of ten closer than Mercury's orbit around the Sun. Which is the most plausible explanation for its large size?
A) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter. B) Planets that are close to a star are hotter, causing them to puff up. C) It is made of elements other than hydrogen and helium which do not compress under their own gravity. D) The hydrogen and helium gas compressed under their own gravity.
Interstellar clouds usually form groups of stars that leave the main sequence at the same time.
Answer the following statement true (T) or false (F)
In general, a common magnet has
A) one pole. B) at least two poles. C) only two poles.