Question

Hawking followed up his book with The Universe in a Nutshell, which offered a more Illustrated guide to cosmology’s big theories.
( Pick out the clause and state its kind)​

Answer 1

He was the first scientist to provide mathematical proof for the existence of black holes. ... Another of the theories put forth by Stephen Hawking states that once a star dies, its entire mass collapses into infinite density or singularity at a single point, leading to the black hole formation.