If black holes absorb everything around them and reduce the mater to nothing, how do they grow? Is the growth comprised of gravity or dark matter? That part has me stumped. I know everything else.
We live in a mixed community. There are bigger black holes in any of my kid’s high school classes.
We live in a mixed community. There are bigger black holes in any of my kid’s high school classes.
The swirls around the hole resemble those in a washbowl sink ... indicating that graviy prevails out there, as it does on earth.
They grow by swallowing up even more. They pull in anything and everything that gets too close, so I imagine they would swallow dark matter and dark energy as well.
http://www.astronomycafe.net/qadir/abholes.html
I presume that this article is describing black holes where the event horizon is about the diameter of the orbit of Neptune around the sun. Everything inside that cannot escape.
The matter that makes up a black hole is "ordinary matter," but squished tight. The atoms around us, what we think of as "solid" stuff, is mostly space. If the nucleus is a marble, the electron shell of hydrogen is about a half-mile diameter (helium is a little smaller, but still, the point being, atoms are mostly empty). Under intense pressure, such as provided by gravity and many close neighboring particles, the electrons meet the nuclei, but the matter is still "ordinary," being detectable by its mass.
If the earth was squished tight, it would be, IIRC, about 150 yard radius. Squished tight enough, it would make a black hole with an event horizon under that size.