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originally posted by: Asynchrony
12 billion times the size of the sun? How do they know that the universe wasn't big banged into existence and instead fell out of that black hole like a wet seal on a waterslide?
originally posted by: eriktheawful
For those that might be confused on Size vs. Mass:
Let's say you have 2 marbles. One made of glass, the other made of lead. Both have a diameter of 1 centimeter. That is their "size".
However, the one made of lead will have more mass than the one made of glass. You can tell this by placing one in each hand. The lead one will be heavier than the glass one.
One way to tell the mass of a black hole is by it's gravitational influence on other things near it. For example, the massive black hole at the center of our galaxy. There are several stars orbiting it. By observing the orbits of those stars, gives astronomers enough information to get a pretty good calculation of the black hole's mass.
Our sun is about 880,000 miles in diameter. If this black hole were to have a "size" 12 billion times that, the answer would be:
10,560,000,000,000,000 miles in diameter. That is 1,796,338 light years.
That's halfway between our galaxy and the Andromeda galaxy.
Sorry, but no.
The formation of the first stars and first galaxies brought about several fundamental changes in the rapidly evolving universe. For one, these stars provided the universe with its first source of elements heavier than beryllium. While conditions early on in the big bang were not appropriate for the generation of the heavier elements, such elements could easily be generated at the cores of massive stars and then later expelled into the surrounding universe when these stars explode as supernovae. The second profound change brought about this first generation of stars was the introduction of high-energy photons into the universe. Previously, the last the universe had seen of such high-energy photons was during the first 400,000 years of the universe when the universe was still very hot and hydrogen still existed in an ionized state.
originally posted by: zazzafrazz
a reply to: Kashai
Are you saying that when mass falls on/into a black hole that the state of its existence can still be expressed externally as mass regardless of it's condition on the inside?
originally posted by: Baddogma
a reply to: bobs_uruncle
White holes are the ol' quasars... of course. Or maybe they spit out the planets surreptitiously... a planet here, one there... so the outpouring is not as noticeable as the black holes hoovering up of mass?
But I do like Unity's theory... even if it's wrong.
Just read the wiki on quasars, they are unique objects. A quasar might be the size of our solar system and have an power output 100 times as much as all the billions of stars in the Milky Way combined. They're quite amazing.
originally posted by: Kashai
What I do not understand is this object a part of a Galaxy and why is the data on the location so generalized?
The event horizon is certainly relevant and is one measure of the "size" of the black hole, but you are correct in stating an observer falling into a black hole wouldn't experience anything special at the event horizon of a black hole of this mass.
originally posted by: zazzafrazz
a reply to: Kashai I was thinking more in terms of general gravitational Influence. I guess some people think the event horizon is part of the size but its not really.
Correct. Astronomers said the event horizon radius of a black hole with mass of 17 billion suns would be about 300 times the distance from the Earth to the sun (aka "AU"), so we can adjust that down a little for 12 billion solar masses.
originally posted by: eriktheawful
Our sun is about 880,000 miles in diameter. If this black hole were to have a "size" 12 billion times that, the answer would be:
10,560,000,000,000,000 miles in diameter. That is 1,796,338 light years.
That's halfway between our galaxy and the Andromeda galaxy.
So the event horizon radius of a 12 billion solar mass black hole might be something like 22,000 times as large as the sun's radius? That's not an exact calculation, but it's definitely nowhere near 12 billion times the radius as you said.
Now, astronomers using the Hobby-Eberly Telescope at The University of Texas at Austin’s McDonald Observatory have identified what appears to be the most massive SMBH ever found, a 17 billion solar mass behemoth residing at the heart of galaxy NGC 1277...
It’s estimated that the size of this SMBH’s event horizon is eleven times the diameter of Neptune’s orbit — an incredible radius of over 300 AU.