age – Astronomy Now

6 October 2024

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The mesmerizing outskirts of NGC 4603 – a key galaxy in Hubble’s ‘key project’

30 August 2021 Astronomy Now

The spiral arms of galaxy NGC 4603 are home to multiple Cepheid variable stars, “standard candles” that helped astronomers pin down the age of the universe in one of the Hubble Space Telescope’s first major projects.