Astronomers Make a New Map of all the Matter (and Dark Matter) in the Universe - by spacewriter
The story of matter distribution began at the moment of the Big Bang, some 13.7 billion years ago. At that moment, all the matter was created. Since then, it’s been spreading out as the Universe expands. As it does, matter cools and clumps together. That clumping means that the Universe isn’t necessarily spread out smoothly. We can see that in the massive congregations of galaxies into today’s clusters and superclusters.
Astronomers can detect distribution “clumping” in the early universe, too. They do it by looking at fluctuations in the microwave background radiation. That’s the very faint light from the Big Bang that is redshifted into the microwave part of the spectrum. The Planck mission measured temperature variations across this microwave background, which was not completely smooth and uniform.
Both efforts used gravitational lensing, which bends light as it passes by areas of space with heavy gravitational fields. That includes galaxies as well as accumulations of dark matter. Both will heavily distort the path of light from more distant objects and events in the early Universe. Coupling data from both surveys actually helps map the existence of both regular matter as well as dark matter.
By comparing maps of the sky from the Dark Energy Survey telescope with data from the South Pole Telescope and the Planck satellite , the team could infer how the matter is distributed. Courtesy: Yuuki OmoriAnalysis of the data from both surveys let the scientists infer where all the matter in the Universe is now. More good news: the results fit perfectly with the currently best-accepted theory of the Universe.
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