How One Supernova Measured The Universe

The video explores the prediction and observation of a supernova in galaxy SP1149 using the Hubble Space Telescope. It delves into the concept of gravitational lensing, which allowed scientists to see multiple images of the same supernova. The video explains how time delays in light travel, due to general relativity, were used to predict the supernova's appearance. It also discusses the implications of these observations for measuring the universe's expansion rate, highlighting the discrepancy between different methods of calculating the Hubble constant.

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