Dr. Brian Keating

It could be that we have to change the laws of gravity.

In other words, it could be that there is no new matter, but gravity is wrong once you get to scales of galaxies.

See, we don't see dark matter effects in our solar system.

As I said, the effect on Uranus was actually the fact that

of ordinary matter made of protons and neutrons, the planet Neptune.

We don't see it on these scales.

In fact, we don't even see it in the entirety of our local solar neighborhood.

It's only when you get to the scale of our Milky Way galaxy and other galaxies beyond the Milky Way that you can even detect that there is something strange going on

with the rate of rotation of galaxies versus the amount of stars that they seem to have in them, stars made of protons and neutrons.

So what we have devised is that there could be, on the other hand, an alternative explanation where you'd have to modify the laws of gravity to explain

the peculiar velocity effects of stars at the outskirts of massive galaxies like the Milky Way.

So that's another explanation.

Now, you might say, well, that's pretty far-fetched, but that's exactly what happened in 1915 with this guy over here, my friend who is visiting me at all times.

Where is this guy?

Come on, he's around here somewhere.

I just picked him up today.

Well, I've got Albert Einstein somewhere around here.

Where is he hiding?

Oh, he's buried under my phone and under my new book, Into the Impossible.

So here's Albert Einstein.