Massive & remote celestial object giving off huge energy and located in galaxies having black holes at their centre
Answers
The universe itself is a great mystery, and we live in a small part of the whole universe and there are many galaxies present in universe among them the Galaxy in which we live is popularly known as the Milky Way.
In a galaxy there are present, massive black holes, these are nothing but a source where everything gets engulfed, not even light can escape it.
The universe is itself a mystery which need to be solved. Eminent physics personalities like the famous Stephen Hawking couldn't himself conclude something about the universe. Universe is itself a mistry which needs to be solved. Physics and mainly astrophysics is the main key of the universe which needs to be unfolded.
There are massive and remote celestial objects which are present on the universe which emits out huge amount of energy and have black hole in the centre is called the galaxy.