Bends my mind
How many Neutrinos have you see lately?
"Eight solid light-years of leadÉis the thickness of that metal in which you would need to encase yourself if you wanted to keep from being touched by neutrinos." -Michael Chabon
There are more atoms in a human eye, then stars in the known Universe. There are about 200,000,000,000 know Galaxies, each with about 200,000,000,000 stars. That's more than 200 billion times 200 billion atoms in a human eye. At any given second, there are 200,000,000,000 Neutrinos passing through every human eye. On the other hand, there is so much empty space in a human eye, that not one of the 200 billion neutrinos in any given second will strike one of the 200 billion times 200 billon atoms in any given human eye. 200 billion times 200 billon is 4 with 22 zeros behind it -- 40,000,000,000,000,000,000,000 ... or ... 40 sextrillion. So, again, there is so much empty space in a human eye, not 1 of 200 billion neutrinos passing through your eye in any given second will strike one of the 40 sextillion atoms there. New research shows that there are at least 700 sextrillion stars in the known Universe, what we can see (we don't know what we can't see).
Restating, I'm amazed at how much stuff exists, and amazed how empty it all is.
And get this, you can see a neutrino strike an atom in your own eye. In a pitch black room, be still, close your eyes, wait for it. That flash of blue light you see is a neutrino sticking one of your own atoms. One estimate is that out of the population of the Earth, we would expect one to five thousand people to have had a neutrino "event" in their body, and perhaps one or two to have an event--- a blue flash---in their eye!
Did you get that? Earth's population is around 7 billion. One or two people on earth may see a neutrino event. In any given second, odds to see a neutrino are 1 in a billion. Odds to win Power Ball are 1 in 300 million, every half week. Each half week has about 250,000 seconds. Odds to see a neutrino in any give half week are .1 in a million. Or, you are 3000 times more likely to see a neutrino than win the lottery.
How many neutrinos have you see lately?
What percentage of all stuff is light (photons)? Bonus, What percentage of all stuff have we not yet identified? Translation, What percentage of all stuff is dark matter plus dark energy?