The Role of Spin in Gravity

Two fermions can't orbit at the same level unless they have a different spin Exactly. Why is that? What does this spin do that lets them occupy the same orbit? So the key thing is that they have to have different quantum states and the spin is part of that quantum state. It's like one of the labels so when you have electrons around an atom you have four of these labels You have n which tells you the energy level you have l which tells you like the sub level That you're in m which tells you which of those l's you're in and then finally the spin. it I wonder if it's a little bit like the earth orbiting the sun Like you know