JAYDEEJOHN said:

Ever see light or any other objects in a black hole?

I know the theory, its just that black holes leave black holes in it sometimes Asking here, did Einstein know the weight of a blackhole then as well?

Also, whats the weight of infinity? Or was that of the known universe at the time?

Also, what was the theorhetical age of the universe at the time, and the collected mass of the blackholes we never saw, or never will?

OK, nevermind, just wonderin heheh

Heh, just saw your response so I'm posting a reply a bit late

..

Anyway, you can think of a black hole in several ways - 1st, the event horizon (which is where a black hole goes "black" - i.e., the Schwarzchild radius) bends spacetime into what looks like a completely black sphere in 3 dimensions, no idea what it looks like in 4 - a tunnel maybe, since time travel is theoretically possible. So light trapped inside the event horizon just travels endlessly inside, as it's local universe is pinched-off from ours. 2nd - since a black hole is equivalent to a bottomless gravitational well, light trapped at a certain depth (below the event horizon) does not possess sufficient energy to escape. A photon's energy is Planck's constant times its frequency (or 2 x pi that amount, I forget). As its frequency can never drop below zero (at least in the physical universe as we currently know it), all those photons trapped below the event horizon threshold would emerge with zero or negative frequency, and thus be undetectable to us. 3rd - since time slows down the deeper you go into a gravitational well, it appears to stop completely to us on the outside, at the event horizon. Hence those photons are frozen in time at the event horizon, or perhaps proceed backwards in time below the event horizon

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Black holes are one of the predictable results of Einsteins general theory of relativity, which is the general case of the special theory, so yes the two are completely consistent with each other. It is quantum mechanics that doesn't fit in with general relativity (at least in a 4-dimensional universe - it does appear to reconcile with general relativity if we live in a 10 or 11-dimensional universe as per string or M-theory).

IIRC current estimates of the observable universe's age is around 13 billion years, and no it does not have infinite mass or extent. And black holes do evaporate with time, due to Hawking radiation from spontaneous matter-antimatter particle generation in empty space at the event horizon. Apparently the probabilities are such that one of particles tend to get captured within the black hole while the other escapes, which means the mass of the black hole decreases. Current theory predicts that a solar-mass black hole that does not receive incoming mass, will evaporate in about 10^67 years. Even the billion-plus solar mass black holes at the center of many galaxies (incl. our own Milky Way) will eventually evaporate in something like 10^150 years.