New measurements reveal the enormous halos that shroud all galaxies in the universe

A team led by Chris Martin at Caltech has used the Keck Cosmic Web Imager to capture the first detailed image of the gas halo surrounding a galaxy.

This “shroud” extends 100,000 light years into space and contains up to 90% of the universe’s normal matter, primarily hydrogen and helium.

The breakthrough was achieved using an ultra-faint spectrograph to observe a seemingly empty region of space around a galaxy.

The images reveal an abrupt transition between the galaxy and its halo and show glowing gas, the cause of which remains unclear, Phys.org has reported.

read more: https://phys.org/news/2024-09-reveal-enormous-halos-shroud-galaxies.html

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