Question

How many neutrinos pass through our body every second?

Answer 1

About `600` trillion

Explanation:

Approximately `6.33*10^14` neutrinos pass through `1m^2` per second from a source `1AU` (astronomical unit) away

The average adult human body has a surface area between `1.6` and `1.9m^2`, generally greater in males than females. We can take the average as `1.75m^2`.

However, not all of the body is exposed directly to the sun. We can approximate that about half of it is face-on, which is `0.88m^2`.

Putting these numbers into a calculation

`(6.33*10^14"neu"/(m^2s))*0.88m^2=5.57*10^14"neu"/s`

This is a very rough guess, but based on this I'd say between around `600` trillion neutrinos per second pass through us.