Author Question: Astronomers believe that a spiral galaxy may form A) from a collision between a small and large ... (Read 40 times)

Pineappleeh · **on:** Jul 27, 2018

Astronomers believe that a spiral galaxy may form

A) from a collision between a small and large galaxy.
B) due to a quasar shutting down.
C) from the sudden contraction of an elliptical galaxy.
D) from the collision of two giant elliptical galaxies.
E) from the explosion of a dwarf irregular galaxy.

Question 2

The center of mass of a binary star system is

A) the center of the most massive of the two stars.
B) the center of the least massive of the two stars.
C) the point halfway in between them.
D) the point at which the two objects would balance if they were somehow connected.
E) the average mass of the two stars.