Science experienced many first-of-a-kind feats this year. These are the groundbreaking achievements that grabbed our attention.
Cosmic web shake-up
Glowing threads of gas, galaxies and dark matter provided the first tangible evidence that shock waves permeate the cosmic web, the large-scale structure of the universe (SN: 3/25/23, p. 14). Simulations had predicted that colliding threads generate shock waves, which catapult charged particles into the web’s magnetic fields and create a faint glow. That aura appeared in data from radio telescopes, confirming the shock waves exist. The glow also provides the first (if indirect) peek at the cosmic web’s magnetic fields.
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