Why do stars in the disk of a spiral galaxy orbit in roughly the ...

[jparksx]

Why do stars in the disk of a spiral galaxy orbit in roughly the same direction, in the same plane in space?
 
  A) It is pure coincidence; the stars just happen to be going in the same direction.
  B) After the stars formed, gravity pulled the stars down into a plane in space, all orbiting a supermassive black hole.
  C) The gas that formed the stars was shaped as a giant, rotating disk.
  D) Collisions between the stars caused their motions to organize into a general, spinning disk direction.

Question 2

All gamma-ray bursters have the same fundamental driving mechanism, although we don't yet know whether it is a hypernova or a merger of two neutrons stars.
 
  Indicate whether the statement is true or false

[zenzy]

Answer to Question 1

C

Answer to Question 2

FALSE

[jparksx]

TYSM

[nguyenhoanhat]

Thanks for the timely response, appreciate it