Perimeter Associate Faculty member Matthew Johnson explains the related concepts of inflation, eternal inflation, and the multiverse. The multiverse hypothesis, he argues, is more than metaphysics — the idea that there might be other universes can be scientifically tested.
Dark matter filament studied in 3D for the first time! NASA/ESA Hubblecast 58: “Caught in the Cosmic Web – Dark Matter Structure Revealed by Hubble Space Telescope”.
In this episode of the Hubblecast, Joe Liske (aka Dr J) shows how a team of astronomers has used Hubble and a battery of other telescopes to discover the secrets of massive galaxy cluster MACS J0717. They have found that an invisible filament of dark matter extends out of the cluster. This is our first direct glimpse of the shape of the scaffolding that gives the Universe its structure.