Wendy Freedman

I think that's what is exciting about the time at which we're making these measurements is that we're pushing the boundaries of what is possible to do with these measurements and to test the framework.

So we talk about a standard model of cosmology.

That's a model that has...

It's a universe expanding.

It has dark matter where you have the ordinary matter that we're made out of is only about one sixth of the total matter in the universe.

We do matter.

A sixth of you matters.

And the other part is not telling us what we're about.

But anyway, we do matter.

We're the luminous stuff.

Yeah, there you go.

The luminous stuff shines a light on the dark stuff.

That's how we learn about it.

Two-thirds a form we call dark energy, which is causing the universe to accelerate.

So there's plenty of room, to get back to your question, for things that

that we don't yet understand because we don't yet know what the dark matter is, despite decades of trying to detect it.

We know it's,

what it does to the luminous matter.

We know that it's there because of its effects on the luminous matter, but we don't know what it is.

It's, it's most probably a particle or leftover from the big bang.