Question

How the scientist found black hole? What he do.

Answer 1

they found the strong gravitational feild 67 light years away from earth with the help of hubble space telescope then they obsereved the sun and other stars as a result theu found that a star having low mass like our sun expands and then becomes a white dwarf but the stars having higher mass such as uy scuti and vy canis turn either into a neutron star or a black hole.