Ultrahigh-energy photons up to 1.4 PeV from 12 γ-ray Galactic sources (2021)

Post by coremoff » Mon, Feb 14, 2022, 12:05 PM UTC

terofle wrote: post #40

coremoff wrote: post #38

Earlier quoted context omitted.

Photons are massless and hence always travel at the speed of light. Photons have a wavelength, and that determins their energy; photons of a same wavelength will all have the same energy; the photons discussed in this article have very short wavelength and very high energy (this energy is proportional to their frequency and inversely proprotional to their wavelength). Regarding electrons; electrons have mass, and the…

> and like all Bosons are massless and hence always travel at the speed of light Not every boson is massless and not every boson is travelling at the speed of light (because there are bosons with mass). Take for example the Higgs boson or the W-bosons.

Post by ipdashc » Wed, Feb 16, 2022, 9:50 PM UTC

adhesive_wombat wrote: post #11

ipdashc wrote: post #10

Earlier quoted context omitted.

> about the same as a decently moving baseball I heard this, but it's hard to believe it's real (or, obviously, I'm misunderstanding it). What would happen if one of these hit a person in space? Would it be the same sort of feeling as getting hit by a baseball? Earlier I wondered how this much energy didn't totally wreck the detector, but someone else posted this link https://www.fourmilab.ch/documents/OhMyGodParticl…

It doesn't interact like a baseball, it just has the energy of one. If it does hit an atom, it produces a shower of other particles, most of which will have similarly huge energies and will probably go right through the rest of the detector and start their own showers in other matter. So you'll get a detector with a few atomic dislocations, and the rest of the energy would be distributed amongst a huge number of othe…