You are presented with the question "what do astronomers get excited about?" and the following answer choices: 
- movements in the earth's crust
 - Earth revolving around the sun
 - earth's core
 - earthworms
 - animals
 - tectonic plates being pushed together
 - Continents drifting
 - high-mass stars collapsing

Now knowing that ablack hole is formed by a high-mass star collapses and black hole excites astronomers, choose the best answer.


 

        high-mass stars collapsing 