2017年5月11日 · The core collapse causes a burst of neutrinos a couple hours before the main explosion. When astronomers detect these surges here on earth, they point telescopes to the source and, low and behold supernova detected before it happened.

Neutrino interactions with matter are improbable, but well-understood. The question of Lethal dose of Neutrino is famous, I've seen it many times and most answers were that's a silly question as there's no lethal dose of Neutrino as they don't interact. It has nothing to do with physical size.

2022年12月30日 · Like.. the CNGS project has CERN shooing a neutrino beam over to the OPERA experiment, through something like 750km of solid rock. Anyway, the authors were probably thinking of Super-Kamiokande, which does use a big water tank, and has a famous picture of some technicians on a raft in the tank, polishing the detectors.

Which is unlikely because the type of stars that go supernova don't generally have habitable planets. And even if your own sun did go supernova, the fact that you just took an unhealthy dose of neutrino radiation doesn't really matter, because you will die shortly after when the supernova vaporizes your planet.

2021年9月26日 · The highest plausible neutrino mass is around 0.1 eV, so neutrinos with a typical energy of 1 MeV have a relativistic gamma factor of 10 million or more. At that point they fall behind at a rate of only ~2 in 10 14 , so we would need to wait for 0.5*10 14 hours = 5 billion years for a single hour difference of emission.

2021年1月5日 · The supernova itself comes with a giant neutrino burst. Again that one can escape the star directly, while the shock wave (which later leads to the visible supernova) needs a few hours longer to make it to the surface.

2020年1月14日 · I'll do you one better- the Supernova Neutrino Alert System, SNEWS. If any star goes supernova in our galaxy (except Type Ia supernovae), it will release a stream of neutrinos that will trigger the neutrino detectors on Earth. SNEWS is set up to send you the alert when that happens, and you'll have a few hours until the optical light reaches us!

Posted by u/noblecheese - 1 vote and 4 comments

2023年5月26日 · Now, the thing about the neutrino burst is we'd get this info a few hours before we could see the light from the supernova itself! This is because neutrinos don't really interact with anything and escape pretty much immediately, but light/shockwave from the collapsed center has to work its way through all the star stuff above it, and this ...

To piggyback, the neutrino burst won't be that long before astronomers see the light, maybe a couple of hours. However, the light from a supernova isn't a sharp spike. The brightness peaks about 2-3 weeks after the supernova occurs, and then it slowly fades over the next few months.