I'm John Natchez with Goverchilling. 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 to heavens, the searching particle physics,

they're in minds 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, D-F-44, that's the name of the galaxy.

They call it the Dragonfly Galaxy, is a problem for everybody. Is there a problem for Mondt too?

It is a problem for Mondt too, because Mondt is, uh, 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 Mondt is correct, then we should see the effects of Mondt 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 Mondt,

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 Mondt too. So, there is this strange galaxy,

uh, that I found a couple of these dark galaxies that seem to be devoid of dark matter,

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 are almost solved the problem. But nature always has the last word.

And if nature comes up to the galaxy with no dark matter, you need to be able to explain that.

And you need to go back to the drawing board and start over your calculations again.

I said earlier my favorite chapter was Mondt. I forgot my favorite chapter was chapter 24, the dark crisis.

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