Facts About the Black holes:

1. The massive gravitational influence of a black hole distorts space
and time in the near neighbourhood. The closer you get to a black hole,
the slower time runs. Material that gets too close to a black hole gets sucked in and can never escape.

2. Material spirals in to a black hole through an accretion disk — a disk of gas,
dust, stars and planets that fall into orbit the black hole.

3.The “point of no return” around a black hole is called the “event horizon”.
This is the region where the gravity of the black hole overcomes the momentum
of material spinning around it in the accretion disk. Once something
cross the event horizon, it is lost to the pull of the black hole.

4.Black holes were first proposed to exist in the 18th century,,
but remained a mathematical curiosity until the first candidate black
hole was found in 1964. It was called Cygnus X-1, an x-ray source in
the constellation Cygnus.

5. Black holes do not emit radiation on their own. They are detected by the
radiation given off as material is heated in the accretion disk, and also
by the black hole’s gravitational effect on other nearby objects (or light passing by).