Black holes...?

Question

1. Have we ever tried sending anything into one with a tracker on it?
2. How did we find out about them?
3. If it sucks up anything around it they eventually eat up the entire universe?
4. If there is more than 1 black hole and they do in fact start sucking everything up what happens if they like go up against each other?
and then a friend of mine wants to know...
5. how do we know we aren't in one?

Answer 1

1. No. None are close enough to reach.
2. They were hypothesized long before we had physical evidence for their existance. Based on the current theory of gravity, it seemed that if something were massive and dense enough, that a black hole would form.
3. They don't suck up everything. Just things that get too close to them. That point of no return is called the "event horizon" Black holes only necessarily pull in things that cross that line. That is a common misconception.
4. It seems that two black holes can combine to form even more massive black holes. Not all black holes are created equally. Some are larger, that is, their event horizons extend further, than other.
5. We could have passed the event horizon of a super giant black hole and wouldn't know it yet. IF that is the case, we can't do anything to get away anyhow, so no point in worrying about it. It is probably unlikely. If you were pulled into a regular sized black hole, you would probably know it because intense gravitational fields exert something called "tidal forces" on objects that get too close. If you don't know about tidal forces, it is an interesting subject. A process called "spaghettification" would occur. Yes, that is the actual term. You would be pulled and contorted something terrible.
Final note for number 5. If you buy the expansion contraction model of the universe, then I would say in essence all matter during that "big crunch" contraction would get combined into one enormous black hole. Of course we (or the matter that makes us) would be part of that.

Answer 2

1. No

2. Astronomers noted that some visible stars wobbled along the path they took through space. This wobble meant that there was some large mass nearby, but nothing could be seen. Then they found that an area near the visible star was emitting lots of radiation. The presence of a black hole was the logical type of object to be causing all these things.

3. The range of gravity for any black hole is limited. No black hole has the gravitational strength to reach out far enough to suck in everything in the universe.

4. Computer models have shown that colliding black holes end up as being merged together into one much more massive black hole.

5. We don't

Answer 3

1) No, they're too far away and you'll run into other complications.

2) We've found out about them by looking at the motion of stars around them, some stars look like they're orbitting nothing at all.

3) No, so far nothing like that has happened, and it's not like a vacuum cleaner or something that sucks things up, it just has a strong gravitational field, so stars and other things can actually just orbit them.

4) It is believed that pretty much every galaxy contains a massive black hole in the center of it, but again they don't just "suck" things up.

5) The laws of physics would probably be very different if we actually could survive in a black hole. But in reality nothing would survive in a black hole. Besides, we haven't detected any near us.

Answer 4

We haven't yet tried sending anything into a black hole because they are hundreds to thousands of light years away and our fastest sattelites have only gone just beyond the solar system. It would take millions of years at the speeds we can obtain right now.

We know about black holes from theory and from observations by telescopes that have seen x-rays from the black hole's event horizon.

Black holes suck up anything that gets near its gravitational influence but that gravity only extends as far as a sun of the same mass because black holes are a product of large suns collapsing. This does not mean they will suck up everything in the galaxy or universe.

Finally, the universe does not have enough matter and dark matter to make it a black hole so we aren't in one.

Answer 5

1. no we have not
2. Not sure how we found out about them but I beleve you can look under Hubble Telescope topics or Stephen Hawkings: Brief Histroy of Time, and learn more about them.
3.No, black hole will not eat up the universe that is a common misconception, the universe is ever expanding. It gets more complicated with virtual particals being created around black holes.
4. Wont happen, use your imagination for this one if you must but refer back to answer 3.
5. We are not in one because a black hole would not allow us to see any light. They suck in light and trap it. The sun we see everyday would not be visible, and our weather patterns would be thrown off causing a massive increase in heat. Eventually leading to an implosion

Answer 6

They combine right into a single black hollow. the two black holes combine to make the "new" black hollow, that's a mixture of the two. Their journey horizons fuse. definite, the end results of two black holes colliding is a much bigger black hollow. The radius of the hot black hollow is approximately the sum of the radii of the two unique black holes. yet black holes are exceedingly small---even a black hollow that has eaten an entire galaxy is smaller than the photograph voltaic gadget. If the Universe maintains to strengthen (as is predicted), then there is not any way that the excellent quantity of the Universe might desire to be taken up with the help of black holes.

Answer 7

You have good suppositions. However scientifically we can only assumes charateristics of a black hole. Of course proving the existance of Black holes is another question which needs to be explained very carefully before we can really accept the theories and suppositions as representing reality.

Answer 8

dude.great questions...but you know, science is all about supposing supposing supposing.coz nothing is for sure.how the hell could we know?..it's something really thought-provoking and i really like the idea of us being in a black hole....hmm...i mean...do they really exist?.. they've been out there for so long.. how come our planet or other stars didn't end up sucked by one of them? if a genie appeared willing to make 3 wishes of mine ocme true, one of them would be what's the whole thing with the black holes? they are like huge darkness filled with mystery.damn.

Answer 9

All seven answers before me are 'beauts'. What a page so far. Haven't ever seen one this good! Cudos from the old guy - Mark B.

I did a dissertation on the same topic for someone else, so my fingers are still tired. You guys(gals)are good. Y!A needs more of this!!
'braxton_...' - Simply marvellous again!!

Answer 10

here's the answer to # 5. is the sun still out? has the Earth froze yet? i dont think so! ofcourse were not in a black hole! a black is WAY smaller than the earth and if there is one thats bigger than the earth trust me it would probably be near Pluto..... DUH!