From StarTalk.

The conversation explains how Type Ia supernovae are used as "standard candles" to measure cosmic distances, thanks to their predictable brightness patterns. This method led to the discovery of the universe’s accelerating expansion and the concept of dark energy.

From ‘Answering Questions About Supernovas, with Michael Shara’: https://youtu.be/CfNGwgGTUX8?si=B7sMwMEaj5mQmeCK

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