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And the dark, the dark, the Dark Ages, the Cosmic Dark Age, is a period of time when light was confined, it wasn't traveling through the universe, it was caught in this huge amount of plasma that was being deflected by all the ions and the heat, the radiation in there, so the photons couldn't escape. It wasn't until later on that they started to cool down around 380,000 years after the Big Bang when light finally escaped the very first photons. But, so during the Cosmic Dark Ages, this dark matter clumped together all through space, and then it pulled the hydrogen gas and emitted intense radio waves. And in Cosmic Dark Ages, there were, as I said, there was a time just before light could travel through the universe. In fact, it was a time before stars were formed, when the universe was filled with this dense fog of plasma. And it's right at this time where dark matter may have compressed clouds of this gas, and the result was radio waves. On Earth, our atmosphere blocks this ancient signal, and studying them requires space-based instruments. Let's drop it.