age – Astronomy Now

24 September 2021

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[ 21 September 2021 ] VIPER rover targets Nobile Crater at Moon’s south pole News
[ 8 September 2021 ] NASA, ESA target 18 December for long-awaited James Webb launch News
[ 6 September 2021 ] After an initial failure, Perseverance collects Martian rock sample News

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.