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Artist's rendering of the universe's first, massive, blue stars in gaseous filaments, with the cosmic microwave background (CMB) at the edges. Using radio observations of the distant universe, NSF-funded researchers Judd Bowman of Arizona State University, Alan Rogers of MIT, and others discovered the influence of such early stars on primordial gas. The team inferred the stars' presence from dimming of the CMB, a result of the gaseous filaments absorbing the stars' UV light. The CMB is dimmer than expected, indicating the filaments may have been colder than expected, possibly from interactions with dark matter. Image: N.R.Fuller/National Science Foundation

Astronomers observed earliest evidence of hydrogen in the universe

MIT astronomers along with Arizona State University scientists report that they have detected faint signals of hydrogen gas from the primordial universe. The researchers have followed...