Fact 1: Ablack hole is formed by a high-mass star collapses.

Fact 2: Black hole excites astronomers.

Given the two facts above, answer the question "what do astronomers get excited about?" with 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 