How One Supernova Measured The Universe

In 2015 astronomers successfully predicted the appearance of a supernova within a couple weeks. How did they do it? Win your Ultimate Tech Bundle by entering Fasthosts’ Techie Test here: (Competition now closed) This video was sponsored by Fasthosts. Special thanks to Geraint Lewis for consulting on gravitational lensing. Check out his YouTube channel: and books: The supernova image in the thumbnail is from my documentary, Uranium: Twisting The Dragon’s Tail. Check it out here: References: DEJA VU ALL OVER AGAIN: THE REAPPEARANCE OF SUPERNOVA REFSDAL P. L. Kelly et al. Predicted properties of multiple images of the strongly lensed supernova SN Refsdal Masamune Oguri. Monthly Notices of the Royal Astronomical Society: Letters, Volume 449, Issue 1, 01 May 2015, Pages L86–L89, Multiple Images of a Highly Magnified Supe