Author Question: Why do stars in the disk of a spiral galaxy orbit in roughly the same direction, in the same plane ... (Read 76 times)

jparksx · **on:** Jul 27, 2018

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