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Supernova "Refsdal," multiply imaged by cluster MACSJ1149.5+2223, representsa rare opportunity to make a true blind test of model predictions inextragalactic astronomy, on a time scale that is short compared to a humanlifetime. In order to take advantage of this event, we produced sevengravitational lens models with five independent methods, based on Hubble SpaceTelescope (HST) Hubble Frontier Field images, along with extensivespectroscopic follow-up observations by HST, the Very Large and the KeckTelescopes. We compare the model predictions and show that they agreereasonably well with the measured time delays and magnification ratios betweenthe known images, even though these quantities were not used as input. Thisagreement is encouraging, considering that the models only provide statisticaluncertainties, and do not include additional sources of uncertainties such asstructure along the line of sight, cosmology, and the mass sheet degeneracy. Wethen present the model predictions for the other appearances of SN "Refsdal." Afuture image will reach its peak in the first half of 2016, while another imageappeared between 1994 and 2004. The past image would have been too faint to bedetected in existing archival images. The future image should be approximatelyone third as bright as the brightest known image (i.e., H_AB~25.7 mag at peakand H_AB~26.7 mag six months before peak), and thus detectable in single-orbitHST images. We will find out soon whether our predictions are correct.

"Refsdal" meets Popper: comparing predictions of the re-appearance of the multiply imaged supernova behind MACSJ1149.5+2223