Editing Hubble Space Telescope (section)

==== Supernova reappearance ====
On December 11, 2015, Hubble captured an image of the first-ever predicted reappearance of a supernova, dubbed "[[SN Refsdal|Refsdal]]", which was calculated using different mass models of a galaxy cluster whose gravity is [[General relativity|warping]] the supernova's light. The supernova was previously seen in November 2014 behind galaxy cluster [[MACS J1149.5+2223]] as part of Hubble's Frontier Fields program. The light from the cluster took roughly five billion years to reach Earth, while the light from the supernova behind it took five billion more years than that, as measured by their respective [[redshift]]s. Because of the gravitational effect of the galaxy cluster, four images of the supernova appeared instead of one, an example of an [[Einstein Cross|Einstein cross]]. Based on early lens models, a fifth image was predicted to reappear by the end of 2015.<ref>{{cite journal |last1=Diego |first1=J. M. |last2=Broadhurst |first2=T. |last3=Chen |first3=C. |last4=Lim |first4=J. |last5=Zitrin |first5=A. |last6=Chan |first6=B. |last7=Coe |first7=D. |last8=Ford |first8=H. C. |last9=Lam |first9=D. |last10=Zheng |first10=W. |year=2016 |title=A Free-Form Prediction for the Reappearance of Supernova Refsdal in the Hubble Frontier Fields Cluster MACSJ1149.5+2223 |journal=Monthly Notices of the Royal Astronomical Society |volume=456 |issue=1 |pages=356–365 |arxiv=1504.05953 |bibcode=2016MNRAS.456..356D |doi=10.1093/mnras/stv2638|doi-access=free }}</ref> Refsdal reappeared as predicted in 2015.<ref>{{Cite journal |last1=Kelly |first1=P. L. |last2=Rodney |first2=S. A. |last3=Treu |first3=T. |last4=Strolger |first4=L.-G. |last5=Foley |first5=R. J. |last6=Jha |first6=S. W. |last7=Selsing |first7=J. |last8=Brammer |first8=G. |last9=Bradač |first9=M. |last10=Cenko |first10=S. B. |last11=Graur |first11=O. |date=February 23, 2016 |title=Deja Vu All Over Again: The Reappearance of Supernova Refsdal |journal=The Astrophysical Journal |volume=819 |issue=1 |pages=L8 |arxiv=1512.04654 |bibcode=2016ApJ...819L...8K |doi=10.3847/2041-8205/819/1/L8 |hdl=1885/153586 |s2cid=32126257 |doi-access=free }}</ref>