Why are collisions between galaxies common, but collisions between stars rare?
A) Stars are very small compared to the distances between them, but galaxies are not.
B) Stars repel each other with stellar winds, but galaxies do not.
C) Stars are much less common than galaxies, so there are fewer of them to collide.
D) Stars do not survive as long as galaxies, so they have less time to collide.
A) Stars are very small compared to the distances between them, but galaxies are not.
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The balance between gravity and ________ creates the internal structure of stars
A) relativistic electrons B) radiation pressure C) the helium flash D) electron degeneracy E) hydrogen gas
The photosphere is the coolest layer close to the Sun, for the radiation of visible light allows it to cool off efficiently
Indicate whether the statement is true or false
Why is the claim of fossilized life in the Martian meteorite ALH84001 controversial?
A) it is doubtful that the rock actually came from Mars B) the proposed fossilized organisms in no way resemble any kind of life found on Earth C) the rock is too young to have fossilized life within it D) there are many possible nonbiological explanations for the observed evidence
How should 
for an ideal gas?
A. 
B. 
C. 
D. One cannot tell without careful calculation.