#astronomy The mesmerizing outskirts of NGC 4603 – a key galaxy in Hubble’s ‘key challenge’ – Astronomy Now

September 5, 2021 - Comment

The outskirts of the galaxy NGC 4603 are filled with a sea of stars as imaged by the Hubble Area Telescope. NGC 4603 was one in all 18 galaxies studied intimately for one in all Hubble’s first main tasks, a seek for Cepheid variable stars at larger distances than beforehand resolved to assist pin down


The outskirts of the galaxy NGC 4603 are filled with a sea of stars as imaged by the Hubble Area Telescope. NGC 4603 was one in all 18 galaxies studied intimately for one in all Hubble’s first main tasks, a seek for Cepheid variable stars at larger distances than beforehand resolved to assist pin down the Hubble fixed and thus the age of the universe. The “key challenge” discovered some 800 Cepheids in far-flung galaxies, permitting astronomers to find out, with an uncertainty of 10 p.c, that the universe was roughly 12 billion years previous. Subsequent analysis pushed the age again to 13.eight billion years with an uncertainty of simply 20 million years or so. NGC 4603 is about 108 million mild years from Earth within the constellation Centaurus.

NGC 4603. Picture: ESA/Hubble & NASA, J. Maund



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