Mousepup wrote:For Neutrino radiation, is a lethal short-term dose in the neighborhood of grams, kilograms or megagrams? I'm looking for a unit of mass, so that I can compare quantitatively to those J and MJ, to help get my head around the stupendosity of "lethal neutrinos."
Sadly, I'm "pretty sure" the required dose is still low enough that the mechanism of organic damage is ionising radiation, as opposed to gravitational interaction. (Gravity for the star itself is enough to be hazardous, but not to such extent that I expect the portion converted to neutrinos to be ...uh, grave.)
A quick WolframAlpha count seems to say that, at a distance of several AU, the rest mass of all passing neutrinos (not only radiation-providing ones, but I suppose they all provide gravity) would be somewhere between kilograms and megagrams per square meter (the uncertainty being due to unclear neutrino mass).
Of course, when it comes to objects travelling close to the speed of light, I'm not sure whether "rest mass" is even a meaningful way to calculate gravitational interaction. And of course any gravitational interaction in this case would be mostly cancelled off by the simple fact of neutrinos going in all directions roughly equally (assuming, of course, that they are - I'm not entirely sure).
There are two films that I particularly like.
One of them is a science-fiction dramatic comedy involving a boy who accidentally travelled in time. Extremely popular when it originally came out in 1985, it retains a major cult following to this day.
The other one, of course, is Back to the Future.