Their study is part of what they call the MUSE Extremely Deep Field, named for the MUSE instrument (the Multi Unit Spectroscopic Explorer), which they used over six nights (between August 2018 and January 2019) mounted on the Very Large Telescope in northern Chile. This is light from about two billion years after the Big Bang, the event in which our universe is thought to have begun, these astronomers said. They did it by managing to capture the light of groups of stars and galaxies that had been scattered by gas filaments in the web. On March 18, 2021, an international team of astronomers published a new study in the journal Astronomy & Astrophysics, showing an image of a piece of the cosmic web – without using bright quasars – for the first time. Previously, astronomers have said they’ve mapped parts of the cosmic web using distant, bright quasars as a guide. ![]() Its walls are made of both dark and visible matter (in the form of billions of galaxies and great quantities of gases), and giant voids are thought to lie between the web walls. This great web provides the scaffolding of our universe. In recent decades, astronomers have begun speaking of the large-scale structure of our universe as a cosmic web. Image (c) ESO / NASA/ Roland Bacon et al. ![]() You can see a filament between the galaxies, tracing the path of the cosmic web. This image looks in the direction of our constellation Fornax the Furnace, to a time 2 billion years after the Big Bang.
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