'Cosmic Fossil' Confirms Einstein's Theory with New Dark Matter Map.

A new map of the cosmos created by the Atacama Cosmology Telescope (ACT) collaboration shows the distribution of dark matter in sharp detail, confirming a theory of gravity pioneered by Albert Einstein over a century ago. The map covers a quarter of the sky over Earth and extends deep into the cosmos, and was created using a "cosmic fossil" known as the cosmic microwave background (CMB), radiation left over from just after the Big Bang. The ACT observations allowed the team to study the effect that gravitational lensing, also predicted by general relativity, has on the CMB, providing them with a great way of mapping ordinary matter and, especially, dark matter, which makes up about 85% of the material universe but remains mysterious.