A small galaxy that existed half a billion years after the Big Bang could be the key to understanding what ended the 'cosmic dark ages.'
's NIRSpec instrument, which also detected strong emission from hydrogen and oxygen gas clouds within RX J2129-z95. These emission lines in the galaxy's spectrum have revealed some of RX J2129-z95's extraordinary properties.
For example, RX J2129-z95 is just 105.6 light-years across, which is tiny compared to the 100,000 light-year-diameter of ouror even modern dwarf galaxies that span several thousand light years. Yet despite having a volume a thousand times less than the Milky Way, RX J2129-z95's rate of star formation is the same as our galaxy's, meaning it is much more intense.
JWST is finding that such high star-formation rates are a fairly typical trait of galaxies in the early universe, but RX J2129-z95 is extreme even as far as high-redshift galaxies go.
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