https://www.freethink.com/space/einstein-rings
Physicists believe most of the matter in the universe is made up of an invisible substance that we only know about by its indirect effects on the stars and...
new lookeinstein ringsdistant galaxiesaroundgot
https://www.nist.gov/news-events/news/2001/03/decay-dark-soliton-vortex-rings-bose-einstein-condensate
Vortices are fundamental excitations of gases and liquids. Well-known examples include tornados, whirlpools, and smoke rings.
dark solitondecayvortexrings