Black Holes Demystified - Episode 2

#blackhole #blackholes #sagitariia #cygnusx1
Black Holes Demystified - Episode 2

10 years after the first black hole Cygnus X-1 was discovered, there was a friendly debate between physicists Stephen Hawking and Kip Thorne, where Hawking didn’t agree that Cygnus X-1 is a black hole. in 1990 Stephen Hawking finally agreed that Cygnus X-1 is indeed a black hole.
In our milky way there are up to 1 billion stellar black holes

The closest black hole to Earth is “V4647 Sagitarii”. It is believed to be 20,000 light years away.

Luckily, there is no chance that earth can be ever consumed by any black hole in the future.
Astronomers classify black holes in three categories.
1. Stellar black holes. When a burnt-out large star collapses into itself, it changes into a stellar black hole. It collapses so much that a star as big as 3 local suns can fit into a small city, and its gravity goes insanely high. In-time, the stellar black hole grows in size by pulling gases and space dust into itself. In milky way alone, there are millions of Steller black holes.

2. Supermassive black holes. There is at least 1 supermassive black hole present in every galaxy. Supermassive black holes usually occur by merging of thousands of Stellar black holes into one. They get more massive by attracting space dust, gas clouds and even dark matter into it.
The Supermassive black hole in our milky way is known as, Sagittarius A.

3. Intermediate black holes. Black holes that are in evolutionary phase, between stellar and supermassive, are classified as intermediate black holes. Intermediate black holes form, when stars in a cluster collide in a chain reaction. In-time, Intermediate black holes merge together to form the supermassive black hole.