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Sextans A

All articles tagged with #sextans a

space2 hours ago•106 min saved

JWST Decodes the Universe's Dust Origins by Studying a Nearby Dwarf Galaxy

Using the James Webb Space Telescope to study Sextans A, a metal-poor dwarf galaxy 4.6 million light-years away, researchers map dust-producing stars and find that about 2–3 billion years after their formation, a subset of asymptotic giant branch stars produced thick dust shells. This helps explain how the first generations of stars seeded the interstellar medium with metals and dust, enabling the early universe to become the birthplace of stars and galaxies.

via Space|

#asymptotic-giant-branch #dust #early-universe

science6 months ago•6 min saved

NASA Webb Discovers Dust-Producing Talent in Early-Universe Analog

NASA's James Webb Space Telescope discovered unexpected dust production in the primitive galaxy Sextans A, revealing that stars can forge solid dust grains, including iron and silicon carbide, even with minimal heavy elements, reshaping our understanding of early galaxy evolution and dust formation pathways.

via NASA Science (.gov)|

#dust-formation #early-universe #metallicity