PeterDonis's latest activity
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PeterDonis reacted to DaveC426913's post in the thread Alien life, probabilities, and interstellar propagation of human life with
Like.
Pretty certain no serious scientist thinks that an individual who cannot reproduce is not alive. So it is not the definition anyone uses... -
PeterDonis reacted to BillTre's post in the thread Alien life, probabilities, and interstellar propagation of human life with Like.
The Fermi paradox is specifically about advanced life able to make contact with us. This is different from the origin of life, but life...
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PeterDonis reacted to PeroK's post in the thread Alien life, probabilities, and interstellar propagation of human life with Like.
The real problem is that if you think there must be numerous advanced civilizations in the Milky Way, then how many are there...
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PeterDonis reacted to DaveC426913's post in the thread Alien life, probabilities, and interstellar propagation of human life with Like.
I think there a few assumptions and misconceptions happening here, and trying to project it onto Fermi's Paradox is making it worse...
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Thank you very much for the thought. We have indeed secured the site and intend to maintain the wood related pages. All the best, Robert
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PeterDonis replied to the thread Paul Hinds has passed.Robert, deepest condolences to you and all of Paul's family. We appreciate your letting us know. Paul was a valued member and will be...
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PeterDonis replied to the thread High School Why does a Wormhole not look like an hourglass?.Yes, that's correct; the hourglass visualization represents 2-spheres by circles, so it's taking out one angular (or rotational)...
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PeterDonis replied to the thread High School Why does a Wormhole not look like an hourglass?.Sort of. A spacelike slice of a wormhole is a very strange thing; it is not like the normal space you're used to. In the normal space...
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PeterDonis replied to the thread Undergrad Merely a thought of where the universe expands into.@Dominion I would recommend spending some time getting familiar with our best current model of the universe and what it actually says...
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PeterDonis replied to the thread Undergrad Merely a thought of where the universe expands into.According to our best current model, the universe is spatially infinite. But it is not expanding into anything. First, this is a pop...
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PeterDonis replied to the thread Undergrad Questioning the timescape model.That still doesn't help, because the area that needs to be covered in the models being proposed can't be limited to just such areas...
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PeterDonis replied to the thread Undergrad Questioning the timescape model.Yes. No, it means that tidal effects are negligible. Tidal effects are not negligible over distance scales much, much, much smaller...
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PeterDonis replied to the thread Undergrad Questioning the timescape model.Galaxy clusters are assumed to be gravitationally bound, yes. However... Because they're gravitationally bound systems. You can't...
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PeterDonis replied to the thread Graduate Universal quantum physics.The standard QM answer to this would be "neither". To model what you are describing in standard QM (at least non-relativistic QM), you...
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PeterDonis reacted to A. Neumaier's post in the thread Graduate Universal quantum physics with Like.
Your question is ill-posed. Since this hydrogen atom interacts with other atoms, it is in a mixed state, obtained from the state of this...