I Level of unseen elastic scatterings

[snorkack]

How often are visible matter particles seen to undergo elastic scattering with particles that remain otherwise unseen?
Known particles that may cause such scattering include neutrinos and antineutrinos (three flavours each) which are also seen in inelastic destruction and formation processes. Also, since dark matter is thought to not fit neutrino properties, that also means unknown number of different dark matter particles are eligible to cause elastic scattering of visible particles.

So, how well is background of elastic scattering events measured?

 

[Vanadium 50]

If it were large distant galaxies would be blurred.

 

[snorkack]

If it were large distant galaxies would be blurred.

Why? No more so than darkness of a closed room.

 

[Vanadium 50]

Scattered light changes direction. If you have a large angle scvatter you can no longer associate it with the source (e.g. the blue sky) and if it's a small angle scatter it's no longer coming from the exact same direction so it blurs.

 

[snorkack]

A muon undergoing elastic scattering off an electron in retina would cause vision the same as a photon being destroyed by interaction with an electron in retina does.
Likewise, a neutrino undergoing elastic scattering off an electron in retina would cause vision. And so would a dark matter particle undergoing elastic scattering of an electron in retina.

 

[Vanadium 50]

And if the universe were a retina, this would matter.

This is silly. I'm out of here.

 

[snorkack]

It matters in terms of observability.
Asking the question this way: do particle observers/astronomers observe any background of low energy but penetrating radiation, in places otherwise sheltered from more visible radiations like visible light or muons? Such as cosmic ray neutrinos, or dark matter particles?