Dark matter is the curious theoretical solution to the observational problem that most of the universe is missing — 85% of it. Learn more
This was first observed in a famous 1919 experiment by astronomer Arthur Eddington, when stars near the Sun during a solar eclipse were seen to be shifted in position. This showed that their light had been bent as it passed through the Sun’s gravity.
Every single ray of light in the cosmic microwave background has arrived, more or less, from the beginning of time. And of course, due to gravitational lensing, its path has been ever so slightly bent by the intervening matter out there in space, such that its trajectory has been something like a wiggle.
“What’s important about these big lumps is that, without them, you wouldn’t have the small scale,” Hincks said. Without huge structures of dark matter to gravitationally harness and collect regular matter, there would be no galaxies, no black holes, no stars. It also matches with observations taken by the Planck satellite, a space-based telescope that operated between 2009 and 2013, also mapping the cosmic microwave background.
A new observatory, being built in the same place as the Atacama Cosmology Telescope, will aim to see the imprint that inflation might have left on the cosmic microwave background.Article content
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