Although we sometimes feel big enough to conquer the world, we should not forget that we’re just a speck of dust in the universe we belong in.

With the recent discovery on the image of black holes whose size is billions larger than our planet, it’s enough to make us question how big we are in the universe.

But what is a black hole, anyway? You probably heard it from movies that are related with ‘space’ such as ‘Interstellar’ and the Star Trek series.

Here’s what you need to know about this dark, mysterious yet fascinating object.

1. Black holes are massive objects from the universe.

Because of the great density and gravitational pull of the black holes, everything that gets struck near them cannot escape, not even light.