Stars and planets orbit around the most dense masses, that's why we orbit the sun. Our main source of evidence is that planets are orbiting and sometimes disappearing into what looks like nothing, but it is a black hole.
A black hole.
We have seem evidence of objects falling into black holes, but most of what we have seen is probably gas. We do not know of any planets that have falledn into black holes.
The first black hole candidate to be discovered is Cygnus X-1, which was identified in 1964. It is located in the constellation Cygnus and is one of the most studied black hole candidates due to its strong X-ray emissions.
No. The most massive black hole we have evidence for may have a mass of about 40 billion suns. This mass would give it an event horizon about 60 billion miles across, which is tiny compared to even the smallest galaxies.
As a black hole.As a black hole.As a black hole.As a black hole.
Quasars have a large black hole, called a "supermassive black hole". The term "supermassive black hole" simply means that it has millions or even billions of solar masses.
As far as we know, most, if not all galaxies have a massive black hole at their centre.
Black holes are formed when a massive star collapses under its own gravity at the end of its life. This collapse causes the star to shrink to a point of infinite density known as a singularity, creating a region with an intense gravitational pull that even light cannot escape from, called a black hole.
The density of a black hole is extremely high, as it is a region of space where gravity is so strong that nothing, not even light, can escape. The density of a black hole is much higher than that of other celestial objects, such as stars or planets, due to its compact size and immense gravitational pull.
None, really. At least, for us, and now. A black hole can be dangerous if it's very massive (such as a supermassive black hole). But mainly, a black hole would be completely harmless, unless it gets close - and the nearest known black hole is at a distance of about 3000 light-years. Even a supermassive black hole would be harmless at such a distance.
A black hole is called a black hole because due to its density and therefore intense gravity, nothing, not even light, can escape it. Though it has extreme mass, it is not a light source, and it will not reflect any light, so it appears as a "black hole" in the universe.As a black hole has massive gravity, light from objects behind it will "bend" around the black hole and an observer will see what is called gravitational lensing. The effect of the lensing will be greatly pronounced because a black hole deforms space-time dramatically. A black hole is a point in space where something is, but because the "thing" that is there generates extreme gravity, it will not be visible under any conditions. It was natural to apply the term black hole to this phenomenon.Because, the huge gravitational forces inside the black hole ensure nothing - not even light - can escape.
Black holes are in outer space, far outside our solar system. Most galaxies have a large black hole at the center.