meta user
network profile
| bio | website | |
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| location | ||
| age | ||
| visits | member for | 1 year, 11 months |
| seen | Oct 7 '12 at 17:27 | |
| stats | profile views | 10 |
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Oct 7 |
comment |
What Problems for 50 year space probe to Alpha Centauri? Thanks. sorry that I got the scale of time so wrong. My idea was to figure out what might happen for a low-cost small mass robot probe, something that we can afford to just launch for the cost of a handful of geosynch comminucation satellites. |
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Oct 7 |
comment |
What Problems for 50 year space probe to Alpha Centauri? Thanks! I know ion thrust can run for a very long time, but I really had no idea of what kind of velocity you end up with. good to know we don't need to worry about the transmision or power supply at least. |
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Oct 7 |
comment |
What Problems for 50 year space probe to Alpha Centauri? Thank you for all of the answers. Also, I apologize for not trying to run some numbers on what speeds an ion probe might get to, and see if it came up with decades or centuries. |
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Oct 7 |
accepted | What Problems for 50 year space probe to Alpha Centauri? |
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Oct 4 |
revised |
What Problems for 50 year space probe to Alpha Centauri? added 178 characters in body |
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Oct 4 |
asked | What Problems for 50 year space probe to Alpha Centauri? |
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Dec 16 |
accepted | Could a viable solar system work with a cluster of dwarf stars in center? And would it last longer than a single stellar mass star? |
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Dec 8 |
comment |
Could a viable solar system work with a cluster of dwarf stars in center? And would it last longer than a single stellar mass star? @Jerry: I was thinking that you would have an existing star system with a stellar mass star as the starting point. But its probably way less effort to move a planet into place around an existing dwarf, than it is to "peel apart" a star into several dwarfs. |
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Dec 7 |
revised |
Could a viable solar system work with a cluster of dwarf stars in center? And would it last longer than a single stellar mass star? updated tag, added note |
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Dec 7 |
awarded | Editor |
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Dec 7 |
revised |
Could a viable solar system work with a cluster of dwarf stars in center? And would it last longer than a single stellar mass star? restructured a little |
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Dec 7 |
asked | Could a viable solar system work with a cluster of dwarf stars in center? And would it last longer than a single stellar mass star? |
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Dec 6 |
accepted | Limit on geothermal energy that could be extracted before the earth's magnetic field collapsed? |
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Dec 6 |
answered | If a puck on ice deccelarates, is its speed “v = v0 - t * a” or is it “v = v0 -k * v0”? |
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Jun 13 |
asked | Limit on geothermal energy that could be extracted before the earth's magnetic field collapsed? |
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Jun 8 |
awarded | Scholar |
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Jun 8 |
accepted | Why isn't black hole information loss this easy (am I missing something basic)? |
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Jun 8 |
comment |
Why isn't black hole information loss this easy (am I missing something basic)? @justin, sry I was not clear. I meant - if the pair creation is going to be able to pull energy out of the BH, then my assumption is that the particles are being created by energy which is inside the BH, but which is uncertainly located, and so you end up with some of the energy actually outside. My thought was this energy-from-inside can represent info from inside, and if that energy just happens to create a particle which escapes, then you could have information escaping. I'd welcome anyones comments on how sound this idea is ... |
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Jun 7 |
comment |
Why isn't black hole information loss this easy (am I missing something basic)? @justin: Hi, my intuition (which could be wrong) is that the pair creation is made possibly by the uncertain position of the energy/information which "should be" inside the black hole, but which uncertainly can be considered outside it. So then it's actually the energy from inside the black hole, with the information from inside the black hole, that created the pair. So then it seems possible for it to retain that information after all? |
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Jun 7 |
comment |
Why isn't black hole information loss this easy (am I missing something basic)? Hi. If I understand the "classical" interpretation -- wouldn't the mass/energy also be required to remain inside the event horizon? I guess I don't see how Hawking can say that energy is allowed to escape without also allowing information to escape. (Now if we assume quantum type of interactions, then I think its saying that the tunneling makes it possible for both to escape) |
