Science Daily is reporting on the characterization of a population of ancient galaxies, formed less than 3 billion years after the Huge Bang, that are as huge as some modern galaxies but are only 1/20 the size. Each of the 9 compact galaxies found is less than 5,000 light-years across, and could fit comfortably inside the Milky Way’s central hub (if you moved the supermassive black hole out first). The stars in these galaxies were 1/2 to 1 billion years old when observed and at least one generation of big stars had already exploded as supernovae.
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