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The Fine Print: The following comments are owned by whoever posted them. We are not responsible for them in any way.
byBenJeremy ( 181303 ) writes:
Seriously, I'm getting very annoyed when particles or chunks of meteorites are somehow identified as coming from some specific place... WTF?
A Neutrino is a Neutrino. It has no identifying characteristic. The nature of a single variable, the charge, may describe the sort of event the particle originated from, but hardly any specificity of the actual event or where that event took place. At least a chunk of space rock might be comprised of minerals that are similar to those from a neighboring planet (though t
bytnk1 ( 899206 ) writes:
Neutrinos, as matter, have plenty of characteristics that could be used to identify them. And saying that it comes from a specific place is not really that difficult since things coming in from space don't take U-turns or pit stops. They come at us in a straight line only perturbed by gravity or other objects that we can observe and compensate for. So if a particle has a certain energy level and direction that does not match anything inside the galaxy, you can do a pretty reasonable job of figuring out where it came from.
As for black holes, yes, nothing is coming out of a black hole's singularity, but the black hole does affect matter outside its event horizon and it is expected that certain black holes will cause matter to be accelerated in such a way that it attains highly energetic characteristics. This is what they mean, or they mean that the neutrino was created in the initial supernova/hypernova that generated the black hole to begin with. Probably the former, as most large black holes are probably generated by accretion over time, and not sudden stellar compression.
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bychihowa ( 366380 ) writes:
When a neutrino impacts a particle in the detector, it creates a cascade of new particles. Since the momentum of the neutrino is conserved in the cascade of particles that can be more easily detected, the direction that the neutrino came from can be determined.
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