The next Big Bang.

[Fluff]

I wonder what is providing the wordclock?

[cjolley]

What Happens if You Fall Into a Black Hole?

http://www.slate.com/id/2199664/

The world's largest scientific instrument, the Large Hadron Collider, will be switched on in Switzerland on Wednesday. A few people are worried that the LHC may cause the world to be swallowed up by a black hole, especially when it starts to operate at full force in the spring. What would happen if you fell into a black hole?
Your body would be shredded apart into the smallest possible pieces. Neil deGrasse Tyson, director of the Hayden Planetarium at the American Museum of Natural History, who wrote the definitive account Death by Black Hole, imagined the experience as "the most spectacular way to die in space."

...

Sweet dreams

[Jon P. Inghram]

The LHC can collide protons at a combined energy of 1.4x10^13 electron volts. Ultra-high-energy cosmic rays can exceed 10^20 electron volts, with one example estimated at 3x10^20 ev. That's 21428571 times the energy of a LHC collision. I'm not worried.

[Marshmallowman]

Well cosmic rays are usualy not protons they are subatomic and most are probably just photons(very energetic ones).

So this is different scenario, but probably really not that different...

As to black holes, the ones we theorise about and have probably observered are self created ones that come into existance since they were objects of such a mass denisity they collapse forming the black holes, if they did not have the required density/mass they could not form.

Current thinking says that blackholes actuall do expel energy along its rotational axis, so they "evaporate" over time. The big ones we see in space gobbling up way more mass/energy than they expel , but the little "micro blackholes" generated experimentally or in the upper atmosphere can NOT suck in enough mass/energy to make up for what they lose so they evaporate quickly.

And to add to that if they were actually stable they are so small it is said they could probably orbit inside of earth without hitting any other matter for a very long time, some say figures I have seen estimate if it was indefintely(not likely, as it needs to consume to surivive)) stable it would take thousands to millions of years to accumulate enough mass before it had an appetite big enough to start chomping down on the earth in any significant way, but as exponential stuff goes it would not be long after that it would have eaten the sun.

Me, I think its a good experiment but well before its time in that the resources used to make it could be spent a lot better elsewhere.
I think a million good scientists with modest budgets would get a hell of a lot more good research done than a thousand scientist with 16 billion dlllar budget. But I guess if your one of those thousand scientist with nobel prize glint in your eye...

Anyway worse comes to worst and it does create a blackhole tha sucks us all in, the world would gets a free trip to the France/Switzerland.

[Nowhere]

Uhm, energetic photons? Every photon has the same rest mass - exactly zero. And every one of them travels exactly at c (what might be different is the amount of them and wavelenghts and the way this infuences their interactions with matter)

The "Oh-My-God particle" was most likely a proton; with macroscopic amounts of energy (quite a good example at wiki - equivalent to well thrown (100 km/h) baseball), travelling at 0.9999999999999999999999951 c. Assuming (and that's a big and most probably unfounded assumption) that it originated in one of the most distant quasars, near the edge of observable universe, they journey, for the particle, took only 2 weeks.

And it seems this photon wasn't totally unique. And it safe to assume that such particles strike also neutron stars (any dangerous black holes created in such collisions would devour them rather quickly due to immense density). And...quite a lot of neutron stars still exist - so we're safe.

BTW Marshmallowman, I think black holes are radiating the energy rather uniformly from it surface (though it might be a bit weird for rotating ones...)

As for costs of the experiment...nah, IMHO this is one of the best ways to spend those few billion bucks (how much one week in Iraq costs?)

PS. OH MY, I WAS WRONG!!! LOOK AT THE EARTH ADVISORY BOARD PUBLIC ANNOUNCEMENT IN MY SIG!!! WE'RE DOOMED!!!

[Brian Ellis]

Well, it's past switch-on time and I haven't yet been swallowed up and converted to an infinty of particles, at least that I know of!

[Marshmallowman]

ahh, not exact scientific but..

radio waves = low energy photons

light waves = "normal" energy photons

x-rays = high energy photons

gama rays = very high energy photons

cosmic rays = very %$%# high photons

the energy is related to frequency e = h.f
see

http://en.wikipedia.org/wiki/Photon

and blackhole emissions(eww)

http://www.space.com/scienceastronomy/black_hole_011003.html

[Marshmallowman]

hehe they will not do a proton proton collision until at least october, they are just testing circulating protons in one direction, and then a bit latter the other direction.

So nothing to worry about yet, just that ominuous hum and dimming lights

[Nowhere]

Luckily, not that far from what I've said how wavelenght influences interactions with matter (uff, haven't forgotten everything yet ); and interactions/with what kind of particles/bonds/how effectivelly photon can interact with depends on its energy after all.

But...gamma rays are the highest energy ones. And cosmic rays are particles (ok, photon also is a particle, let me rephrase that: "...particles with non-zero rest mass" ). Like solar wind, more or less...

And the last link doesn't really discuss emissions of a black hole (that would be Hawking radiation, which should, I think, by nature of its formation, be spread uniformly on event horizon - and when discussing micro black holes we deal with Hawking radiation), but energetic processes resulting form infalling matter. And they would take place when matter falls onto any compact object (like onto alternatives to black holes I mentioned earlier in this thread - actually, some distant quasars display properties that are inconsistent with black hole, but would be fine if those are magnetospheric eternally collapsing objects)

[Marshmallowman]

yeah you are right, cosmic rays are not photons... and according to wikipedia 90% are protons so ... oops

http://en.wikipedia.org/wiki/Cosmic_ray

So i have forgot a lot as well

and some blackhole stuff

http://en.wikipedia.org/wiki/Hawking_radiation

You are right about the emissions coming from around the event horizon, I must have been thinking of the initial burst from along the axis during the formation of the blackhole /collapse of the star

[Nowhere]

I think this burst falls also into category of energy radiated away and jets caused by infalling matter...it's just that there's really a lot of matter just after formation of black hole (outer layers of parent star)

Which BTW means that if black holes produced by LHC turn out to be dangerous after all, we'll go in quite a blast (I'd guess Earth will outshine the Sun for a short time)

[Brian Ellis]

(I'd guess Earth will outshine the Sun for a short time)

AH! You mean that a supernova is where a green man on a distant planet is testing his new Hadron collider?

[spadnos]

(snip)
And to add to that if they were actually stable they are so small it is said they could probably orbit inside of earth without hitting any other matter for a very long time, some say figures I have seen estimate if it was indefintely(not likely, as it needs to consume to surivive)) stable it would take thousands to millions of years to accumulate enough mass before it had an appetite big enough to start chomping down on the earth in any significant way, but as exponential stuff goes it would not be long after that it would have eaten the sun.
(snip)

Uh - one little point here: a black hole doesn't create mass, it only aggregates it. Even if a black hole were made, and after a few thousand or a million years it ate the earth, the end result would have the mass of the earth. It would be in the same orbit as the earth. It would therefore have the exact same gravitic effect on the rest of the solar system as the earth. Even the "seed mass" to make the initial black hole is part of the earth's mass (or solar energy infall) - the power to accelerate those particles had to come from somewhere, after all.

- Steve

[Nowhere]

Though eventually it would eat the Sun, after the latter engulfs it when going into red giant phase.

Also, I imagine that the immense radiation associated with last moments of accreting the Earth mass would have some influence on the rest of the system. Nothing profound, when it comes to measurable effects probably just influencing orbits of few asteroids/comets and also changing a bit orbit of the Moon (with a little melting of Moon surface perhaps?)

[SitFlyer]

http://www.hasthelhcdestroyedtheearth.com/