The dark matter in the oldest known galaxies in the universe has been mapped. In the new map created by scientists, 1.5 million galaxies are seen as they were 12 billion years ago. Scientists have mapped dark matter around the oldest, most distant galaxies ever recorded. One and a half million galaxies are seen as they are, 12 billion years ago, or less than 2 billion years after the Big Bang. These galaxies distort the cosmic microwave background—light emitted from an earlier era of the Universe—as seen from Earth. This visual distortion, called 'gravitational lensing', reveals the distribution of dark matter around these galaxies, as scientists report Aug. 5 in the journal Physical Review Letters.
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