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There's not enough of it there to account for how galaxies and planets and solar systems are kept together. If there was only the amount of mass and universe that we see around us, galaxies would be flying apart, stars wouldn't be able to stay together, our solar system would be flying apart this way and that way. So there has to be something else out there that's producing enough gravity to keep everything together. And the only possibility is dark matter, a very strange form of matter that makes up the vast majority of the matter in our universe. And this was a study that came out of the Tel Aviv University, this topic. And researchers, they've now predicted that dark matter might be discovered by listening to radio waves from the very early universe. And it's thought that during the cosmic dark age, that dark matter clumped together all through space and pulled in hydrogen gas that then emitted intense radio waves.