Astronomers Astonished By Twin Cosmic Rings That Dwarf Entire Galaxies
A double-ringed Odd Radio Circle of magnetized plasma, hundreds of thousands of light years across, was detected 7.5 billion years away; its origin is unexplained.
Want to See Dark Matter? Start with the Bullet Cluster
The Bullet Cluster reveals a separation between galaxies, hot intracluster gas, and dark matter during a massive collision, providing strong observational evidence about dark matter behavior.