The journey continues towards the black hole.

So, what happens around it…?

         The mysterious objects that lie far away beyond our reach are those mysterious objects that give very little information about them, but the search for all new information goes on every day and every time we get some new information. We know and can tell what happens outside the black hole near it, but we don't have any chance to know what's inside it. As we approach the event horizon, the pull of gravity towards its center, i.e. the singularity, becomes so strong that we must travel faster than the speed of light to escape, which is currently impossible for us. Also, if we try to send a probe inside it, then it will be impossible for it to transmit signals back to us, as the pull of the black hole is so strong that even light can't escape its grasp.

Thermodynamics opposes it.

       So, according to it, whatever goes inside never comes back. This is what deviates from the second law of thermodynamics. Imagine if you threw a bucket full of hot water into a black hole. Then, according to the second law of thermodynamics, entropy is always an increasing function in a closed system, and the universe is a closed system. So, the hot water thrown inside a black hole will lose its entropy eventually as it falls into the black hole.

So, how are they so bright ?

       The black part that we see is actually the event horizon. Then what's the big deal about? A black hole is the singularity that lies at the centre, deep inside, where the whole mass is dense. When we see a picture of a spiral galaxy, we see a super source of light at the centre of it. That is a black hole. But from where the light comes from, as we know, even light can't escape the pull of a black hole. So, the light that we see comes from the magnetic field near a spinning black hole that propels electrons outward along the rotational axis and produces radio waves.

Quasars are quasi-stellar objects that are very highly energetic objects that surround an actively feeding, super massive black hole. That is, the black hole at the centre of each galaxy continuously feeds intermittently, and due to these feedings, highly dense gas moves at a very high speed. It forms an extremely bright and hot disc spiralling around the black hole, and if this black hole is continuously swallowing a large amount of material, this feeding results in gigantic jets of gas that are quasars. These quasars are the fuel for the black hole. But still, black holes continuously radiate their mass away, like a pot filled with water boiling on the stove and the water turning into steam and becoming smaller and smaller. This is known as Hawkins radiation. But this process is very, very slow.