Then, quantum mechanics and how it determines some of the structure

of atoms, and then we'll apply it to Jupiters and brown dwarfs.

So, quantum mechanics.

Let's begin with two important ideas in quantum mechanics.

The first is what's called the Heisenberg Uncertainty Principal.

That you can't simultaneously know the position and momentum of a particle.

That there's an intrinsic uncertainty in figuring out exactly

where a particle is, and exactly what it's momentum is.

And no matter what you do, you can't determine

the position and momentum better than to a constant.

Actually this constant h we've seen before, that's

the Planck's constant involved in properties of radiation.

Then Planck's constant divided by two pi