I'm John Batchel with Govert Schillig.

His wonderful new book, The Elephant in the Universe, is the frontier of thinking about dark matter, dark energy, and our universe.

100-year search.

Right now, however, the searching the heavens are searching particle physics.

They're in mines waiting for collisions.

And we come to, uh-oh, an exception.

They found a galaxy without cold, dark matter.

They found several of them, in fact.

And that worries everybody.

Or the quote, DF44, that's the name of the galaxy. They call it the dragonfly

galaxy is a problem for everybody. Is it a problem for Mun too? It is a problem for Mons too, because

Mons is this alternative theory that tries to explain dark matter not by introducing a new particle,

but by assuming that our theory of gravity is wrong.

Now, if Mont is correct, then we should see the effects of Mont in each and every galaxy,

because they don't assume that there is dark matter. They just assume there are stars and gas clouds

with a different gravity than we are used to think of.

So according to Mont, each and every galaxy should show these effects of their alternative gravitational theory.

And if you see a galaxy without the gravitational effects that we attribute to dark matter, then it cannot

be explained by months too. So there is this strange galaxy that I found a couple of these dwarf

galaxies that seem to be devoid of dark matter, and no one has a good explanation for it. And so it's another way science works.

You can have theories, you can have experiments, you can make conclusions and think that you

almost solve the problem.

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