Use these questions to test your understanding. If you get them wrong, you will be linked back to the relevant part of the notes. 

Be sure you study them thoroughly (don't just get a quick fix for your mistake) so your overall understanding is improved.

1. When galaxies collide

   a. they explode

   b. they pass right through each other with no other consequences

   c. they tend to merge into a single galaxy

   d. there is a loud noise

   e. this happens so seldom we do not have a good idea of what happens

2. Galaxies undergoing starbursts

   a. are full of bursting stars

   b. are usually ellipticals

   c. were identified through clusters of stars bursting out from them

   d. are forming massive stars rapidly and in exceptionally large numbers

   e. have less dark matter than other galaxies