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Galaxy Clusters

galaxy seen from the side

New AI Distinguishes Dark Matter from Cosmic Interference

This artist's concept shows what happened when two massive clusters of galaxies, collectively known as MACS J0018.5, collided: The dark matter in the galaxy clusters (blue) sailed ahead of the associated clouds of hot gas, or normal matter (orange). Both dark matter and normal matter feel the pull of gravity, but only the normal matter experiences additional effects like shocks and turbulence that slow it down during collisions.

Dark matter flies ahead of normal matter in mega galaxy cluster collision

Composite colour image of the interacting galaxy cluster El Gordo, showing X-ray light from NASA's Chandra X-ray Observatory in blue, optical data from the European Southern Observatory's Very Large Telescope in red, green, and blue, and infrared emission from NASA's Spitzer Space Telescope in red and orange.

Study Suggests Dark Matter May Be Self-Interacting in Massive Galaxy Cluster Collisions

Composite colour image of the interacting galaxy cluster El Gordo, showing X-ray light from NASA's Chandra X-ray Observatory in blue, optical data from the European Southern Observatory's Very Large Telescope in red, green, and blue, and infrared emission from NASA's Spitzer Space Telescope in red and orange.

Titanic galaxy cluster collision in the early Universe challenges standard cosmology

Like Goldilocks, the team compared the number of galaxy clusters measured with predictions from numerical simulations to determine which answer was “just right.”

Matter comprises of 31% of the total amount of stuff in the universe

An example of a gravitational lens found in the DESI Legacy Surveys data. There are four sets of lensed images in DESI-090.9854-35.9683, corresponding to four distinct background galaxies — from the outermost giant red arc to the innermost bright blue arc, arranged in four concentric circles. All of them are gravitationally warped — or lensed — by the orange galaxy at the very center.

Astrophysicists show how to “weigh” galaxy clusters with artificial intelligence

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