Black Hole Formation

 

We primarily categorize black holes into four types:

 Stellar black holes are formed when a massive star has exhausted its fuel and the nuclear fusion counteracting its gravity stops, the star collapses upon itself and sends shock waves resulting in an explosion (supernova). If the star is massive enough, the collapse cannot be stopped and all the remaining mass is smashed into an infinitesimally small area called a singularity, making it extremely extremely dense and forming a blackhole. 

The second and my favourite are Supermassive blackholes, which are found at the centre of most galaxies. No one is really sure how these were formed, but a leading theory is that they formed by the death of supermassive stars in the early universe. They could have also grown supermassive by accumulating or accreting unthinkable volumes of material over billions of years.

The third are Intermediate blackholes. Scientists were really puzzled about the size difference between stellar and supermassive blackholes. That’s when intermediate blackholes were theorized, having an intermediate size in terms of blackholes. They could be formed due to stellar blackholes merging with each other, or could be due to stars in dense clusters collapsing, or could be primordial.

Which brings us to the fourth and last type, primordial blackholes which formed right after the big bang. Back then, the universe was quite uniform having been born seconds ago. However, there could have been tiny fluctuations in the density of matter. Some regions could have become significantly denser than others. Those regions could have collapsed under their own gravity to form a black hole.

That's it about black holes. Go eat.