age – Astronomy Now

17 January 2022

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[ 17 January 2022 ] Black hole contains nearly all the mass at the heart of the Milky Way News
[ 10 January 2022 ] Webb mirrors fully deployed, clearing the way for alignment News
[ 5 January 2022 ] ‘We nailed it!’ Webb clears major hurdle with full sunshade deployment News
[ 3 January 2022 ] NASA holds up final Webb sunshade deploy to double check readiness News
[ 31 December 2021 ] Webb ready for critical work to open sunshield 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.