Rotation curves for spiral galaxies show A) they are slowing ...

[Diane]

Rotation curves for spiral galaxies show
 
  A) they are slowing down.
  B) most have dark halos.
  C) rotation speed drops off further from the nucleus.
  D) most of the mass lies in the nucleus.
  E) no relation to mass.

Question 2

If the collapsing star is over 25 solar masses, the core may form ________ in a hypernova event.
 
  A) a gamma-ray burster
  B) a millisencond pulsar
  C) an X-rays burster
  D) a pulsar
  E) a black hole

[dlook33]

Answer to Question 1

B

Answer to Question 2

E

[Diane]

YES! Correct, THANKS for helping me on my review

[marict]

Thanks for the timely response, appreciate it