Question

what is supernova and black hole

Answer 1

A black hole is a region of space where gravity is so strong that not even light can escape its grasp.
a supernova is a rapidly expanding ball of exploding gas, while a black hole is a large amount of mass squished into a relatively small volume of space.

Answer 2

Supernova- is a state of explosion in universe which occurs when a large star (at least 2 times of sun) explode which generate a huge amount of energy and light(about 1000 times more than its light when it was a star).It occurs at the last stage of star when the iron element becomes the majority element in a star core. After the super nova the star radiates it's energy or becomes neutron star or black hole.
Black hole- Black hole is the most dense body in universe with a huge dense gravitational force that even light can't escape from its gravitational field. It is like a hole in space time. According to a theory ' A supermassive black hole is present at the centre of a galaxy around which all the stars and heavenly bodies revolve.' A star only becomes a black hole if it's mass is at least 3 times more than sun.
Largest Black hole-
SDSSJ010013.62+280225.8
Smallest Black hole-
A1689B11
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