In their search for dark matter, astronomers can exclude the possibility that cold gas clouds account for dark matter because cold gas clouds ______________.
A) have very low mass
B) would be detectable by radio telescopes
C) do not produce gravitational force
D) would emit visible spectral lines
E) would slow down the rotation of the galaxy

Question

Quizplus · Accepted Answer

Cold gas clouds would be detectable by radio telescopes because they would emit radio waves, which astronomers have not observed in the amounts needed to account for dark matter.

In Their Search for Dark Matter, Astronomers Can Exclude the Possibility