Author Question: Which galaxy rotation curve, based on hydrogen gas speeds and locations, would indicate an unusually ... (Read 5 times)

waynest · **on:** Jul 27, 2018

Which galaxy rotation curve, based on hydrogen gas speeds and locations, would indicate an unusually large amount of dark matter?

A) Orbital speeds remain constant, beyond where the stars are.
B) Orbital speeds rise, beyond where the stars are.
C) Orbital speeds decline, beyond where the stars are.

Question 2

What is true of Titan's atmosphere?

A) It was discovered by the Voyager 1 spacecraft.
B) It is roughly similar to Earth's in composition and density.
C) It has produced a runaway greenhouse effect.
D) It is oxygen rich.
E) It is primarily hydrogen.