Black Holes; a layman’s explanation

[Jitendra Hydonus]

This is not my definition. I got it off the internet.

What Is a Black Hole?

Despite the slightly ominous sounding name, which brings to mind images of bottomless wells and creepy caverns, a black hole is actually the opposite of what it sounds like; rather than being an absence or empty space, black holes consist of a great amount of celestial matter densely packed into a very small area. Their weight is immeasurable and creates a gravitational pull so strong that nothing can escape from it- not even light, hence their name.

Einstein was one of the first to explain how black holes form through his theory of relativity, which states that all actions must have an equal reaction. Without needing an advanced degree in astrophysics to explain it, as the energy expended by a star wanes, that energy collapses within itself and “dies,” leaving behind a small remnant core. If this core’s mass is heavy enough, the force of the gravity it creates overwhelms all other forces and creates a black hole, rather than just winking out of existence as other smaller stars do.


https://astrologyanswers.com/article/what-is-the-significance-of-black-holes-in-astrology/

[mccoy]

OK, I saw this thread right now, we can start from here!

[mccoy]

So, black holes, or dark stars, as the first physicist who postulated their existence, John Mitchell, a priest, called them in 1783. He had an intuition way, way ahead of his times. By focusing on the idea and by maybe some suggestion from some astral beings, he drew from one of God's spheres of thought an idea existing in the causal realms that nobody else grasped before, in this civilization.

A black hole is called black since it is not directly visible because it emits no light. Nothing, not even the photons, the light particles, can escape its immense gravitational field. It can be seen indirectly, by its halo, he glow emitted by the plasma-state particles rotating around it, with the light distorted by the huge gravitational field. So far, we have radio images of two black holes, both located in the center of a galaxy. One of them is Sagittarius A*, the center of our galaxy. In the following picture what we see is the glow of the trapped particles, glow which is amplified in some parts by the light distortion.

[mccoy]

How are such bizarre objects formed?

The larger ones are the result of a sort of an arm-wrestling process. The star's internal pressure tends to project matter outside whereas the star's mass pulls matter inside .

When the latter prevails, the star sort of implodes in itself, (the so-called gravitational collapse) cramming all of its matter into a ridiculously small volume. The huge concentration of mass gives birth to an extremely strong gravitational field, which sucks everything in, and lets nothing out.

Not every star can become a black hole, our sun will become a white dwarf, some stars become neutron stars, very dense but not enough to suck in everything, and many stars will explode (supernovas), losing their outer layers before the inner layers collapse in a cosmically huge implosion.

[mccoy]

OK, I'll stop here, time for a discussion!

[mccoy]

I'll take advantage to insert a very clear image from Wikipedia (stellar evolution). Black holes evolve out of massive stars and so-called type 2 supernovae events. As explained above, the implosion/collapse of the inner core occurs after the titanic explosion/expulsion of the outer layers. Stars with mass close to that of the sun cannot evolve in black holes, it seems that it is needed at least 2 or 3 sun masses to potentially evolve in a black hole, with the right conditions (the following figure says at least 8 solar masses, but sources can diverge).