Ablack hole is formed by a high-mass star collapses, and black hole excites astronomers. Given these facts, what do astronomers get excited about among the following options:
- 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


 

        high-mass stars collapsing 