A black hole is formed by a high-mass star collapses.
Essentially, a black hole is a gravity drain.
A gravity drain is formed by a high-mass star collapses.
What is formed by a high-mass star collapses?
A. grave error
B. an object
C. a gravity drain
D. mass grave
E. deoxyribonucleic acid
F. Physical weathering
G. gravity depletion
H. hydrogen and oxygen