>>9
"It was quite the most incredible event that has ever happened to me in my life. It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you. On consideration, I realized that this scattering backward must be the result of a single collision, and when I made calculations I saw that it was impossible to get anything of that order of magnitude unless you took a system in which the greater part of the mass of the atom was concentrated in a minute nucleus. It was then that I had the idea of an atom with a minute massive center, carrying a charge."
Rutherford on the experiment you mentioned. This doesn't explain why, this just states it is indeed that way even though this is not enough evidence for me. You were a successful student all through school, right?...but i have bad news for you you will never be significant as a scientist. Don't aim to become one.