This is a series

cbess I in the world.

I'm John Batche with Gobert Schilling.

His new book is The Elephant in the Universe,

100 year search for dark matter, and Govered's search over several years

for dark matter.

He's still looking.

It's a joy to travel well along with him in the book.

We know it, neutrinos don't qualify, although that's a cool idea because it took on a long time to find neutrinos

And they had a theory and they went looking for it and and it paid off

Gravitinos also don't satisfy and rather than pursue that I'm going to come to the

a cosmologist Jim Peebles. Jim Peebles says we have something that is cold, that is dark, that is matter, cold, dark matter.

However, it has to satisfy a transformation from the smoothness of the beginning of the big bang to the clumps we have today.

That means dark matter has to satisfy something well calling it weird is inadequate

it has to satisfy something where it what does it interact with in that

transformation what what do we imagine does it have interaction with anything in that much. We know dark matter or the cold dark matter, as Jim Pels called it, must be

interacting through gravity because that's how we how we discovered it. We see the

gravitational effect. It must have mass. It must have mass it must have gravity otherwise it doesn't it doesn't fit in in

what we are observing but it doesn't have an electrical charge. So it doesn't interact with

with light. It doesn't interact with magnetism. It doesn't interact with

radiation. It doesn't interact with all the charged particles. It does not

interact with the strong nuclear force that holds

...