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    First Galaxies tagged posts

    Non-detection of Key Signal allows Astronomers to Determine what the First Galaxies were – and weren’t – like

    November 29, 2022, Categories  Astronomy/Space

    Observations by the NASA/ESA Hubble Space Telescope have taken advantage of gravitational lensing to reveal the largest sample of the faintest and earliest known galaxies in the universe.
    Early galaxies capture by the NASA/ESA Hubble Telescope
    Credit: NASA Goddard

    Researchers have been able to make some key determinations about the first galaxies to exist, in one of the first astrophysical studies of the period in the early Universe when the first stars and galaxies formed, known as the cosmic dawn.

    Using data from India’s SARAS3 radio telescope, researchers led by the University of Cambridge were able to look at the very early Universe — just 200 million years after the Big Bang — and place limits on the mass and energy output of the first stars and galaxies.

    Counterintuitively, the researchers were able to place these limits on the earliest galaxies by not finding the signal they had been looking for, known as the 21-centimetre hydrogen line.

    This non-detectio...

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