The most common main-sequence stars have spectral type
A) G.
B) A.
C) O.
D) M.
D) M.
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Based on models, how does Jupiter's core compare in size and mass to Earth?
A) It is about the same size and mass as Earth. B) It is about 10 times as large in both size and mass as Earth. C) It is about the same mass, but is 10 times as large in size as Earth. D) It is about the same size, but has about 10 times as much mass as Earth. E) Jupiter doesn't have a core—it is made entirely from hydrogen and helium.
Compared to stars within the disk, halo stars
a. orbit at random inclinations to the galactic plane b. orbit at different speeds c. orbit with paths crossing d. All of the other choices are correct.
A bicycle that travels twice as fast as another when braking to a stop will skid
A) twice as far. B) four times as far. C) eight times as far D) sixteen times as far. E) depends on the bike's mass
You can increase the temperature of a gas by compressing it
Indicate whether the statement is true or false