The Reappearance of Supernova (SN) Refsdal
Key Points Astronomers have been trying to understand space for thousands of years. Supernova Refsdal was the first known multiply imaged supernova. Multiple images of the supernova are due to strong gravitational lensing. Astronomers managed to predict the reappearance of the supernova. Multiple images of the supernova have a time delay between them. HST observations…