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    cold hydrogen gas tagged posts

    Hubble finds Early, Massive Galaxies Running on Empty

    September 25, 2021, Categories  Astronomy/Space

    These images are composites from NASA’s Hubble Space Telescope and the Atacama Large Millimeter/submillimeter Array (ALMA). The boxed and pullout images show two of the six, distant, massive galaxies where scientists found star formation has ceased due to the depletion of a fuel source – cold hydrogen gas. Hubble, together with ALMA, found these odd galaxies when they combined forces with the “natural lens” in space created by foreground massive galaxy clusters. The clusters’ gravity stretches and amplifies the light of the background galaxies in an effect called gravitational lensing. This phenomenon allows astronomers to use massive galaxy clusters as natural magnifying glasses to study details in the distant galaxies that would otherwise be impossible to see...
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