That doesn't make any sense. Photons would work much better.

Photons work better for driving a car too but being able to hear is still quite useful.

In other words: we already have lots of things that measure photons. You see things on two totally different media it's a lot more compelling than just one.

That may be the case, but it doesn't explain why neutrinos would be essential for intergalactic communication. Maybe the person I was responding to didn't realize neutrinos travel very close to the speed of light, not infinitely fast?

Neutrinos might be a better medium for intergalactic communication, since they can travel through most objects.

Or we can all just think big thoughts at the same time... https://en.wikipedia.org/wiki/Calling_Occupants_of_Interplan...

Kind of contrived, but if you're sending a signal from some other planet to our planet, depending on the geometry, there will be times of the year that our local star is in the way of photons.

Also, if you're sending out photons from a planet, chances are there's a local star nearby. Stars tend to be a broad-spectrum photon source, which is going to make it tough for receivers to decode the intentional signal.

Which is more difficult:

(1) Putting a telescope in space

(2) Focusing and detecting very high energy neutrinos

This is especially the case when photons will have, what, 15 orders of magnitude less energy than the neutrinos?

> Which is more difficult:

This is why I always search for my keys under the streetlamp, even though I dropped them in the unlit field nearby.

That said, putting a telescope in space is easy; we've done it several times...

But, can we filter photons intentionally sent from some far off solar system out of the stream of photons coming from their local star?

Yes. It's been proposed for SETI inside our galaxy too, and could be done with current technology (at least, receiving).

It would be VASTLY easier than using neutrinos.

Neutrinos are not an analog to sound in the point you are trying to make. They are many orders of magnitude more weakly interacting and much, much difficult to measure.