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: fasthosts.com/veritasium (Competition now closed) This video was sponsored by Fasthosts.

Special thanks to Geraint Lewis for consulting on gravitational lensing. Check out his YouTube channel: ve42.co/gfl and books: ve42.co/GFLbooks

The supernova image in the thumbnail is from my documentary, Uranium: Twisting The Dragons Tail. Check it out here: genepoolproductions.com/uranium-project

References:
DEJA VU ALL OVER AGAIN: THE REAPPEARANCE OF SUPERNOVA REFSDAL
P. L. Kelly et al. arxiv.org/abs/1512.04654

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, arxiv.org/abs/1411.6443

Multiple Images of a Highly Magnified Supernova Formed by an Early-Type Cluster Galaxy Lens
Patrick L. Kelly et al. arxiv.org/abs/1411.6009

«Refsdal» meets Popper: comparing predictions of the re-appearance of the multiply imaged supernova behind MACSJ1149.5 2223. T. Treu et al. arxiv.org/abs/1510.05750

Irwin I. Shapiro (1964). «Fourth Test of General Relativity». Physical Review Letters. 13 (26): 789–791. doi:10.1103/PhysRevLett.13.789

Irwin I. Shapiro; Gordon H. Pettengill; Michael E. Ash; Melvin L. Stone; et al. (1968). «Fourth Test of General Relativity: Preliminary Results». Physical Review Letters. 20 (22): 1265–1269. doi:10.1103/PhysRevLett.20.1265

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