This ring of light is actually a galaxy a lot like our own Milky Way, with a rotating disk and a bulge around its centre. It is gravitationally lensed by a nearby neighbour galaxy, which makes it appear to us as a near-perfect circle. Astronomers spotted the distant (and thus ancient) SPT0418-47 galaxy using the largest radio telescope in the world, the Atacama Large Millimeter/submillimeter Array telescope in Chile. (Science | 3 min read)
Reference: Nature paper (ALMA (ESO/NAOJ/NRAO), Rizzo et al.)
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