Author Question: What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an ... (Read 65 times)

pepyto · **on:** Jul 27, 2018

What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo?

a. Small velocities are seen at large distances from the galactic center.
b. Small velocities are seen at distances close to the galactic center.
c. Large velocities are seen at large distances from the galactic center.
d. Large velocities are seen at distances close to the galactic center.

Question 2

The carbon-nitrogen-oxygen cycle

a. operates at a slightly lower temperature than the proton-proton chain.
b. is most efficient in star less massive than the Sun.
c. occurs when carbon and oxygen combine to form nitrogen, which produces energy.
d. produces the energy responsible for bipolar flows.
e. combines four hydrogen nuclei to form one helium nucleus, which produces energy.