Look at it this way: Solar neutrinos carry away approximately 1% of the total fusion power output of the Sun. This works out to about 14 Watts per square meter at the distance of the Earth. The area of a human adult body front-on is about a square meter.
It's pretty easy to detect 14 W of typical forms of radiation at those scales! If it were light, it would be equivalent to the light put out by something like a laptop screen, spread out just a bit. You can see something like that with your eyes from a kilometer away!
It's pretty easy to detect 14 W of typical forms of radiation at those scales! If it were light, it would be equivalent to the light put out by something like a laptop screen, spread out just a bit. You can see something like that with your eyes from a kilometer away!