New Telescopes May Spot Black Hole's 'Photon Ring'

Faint rings of light surrounding enormous black holes could be spotted with the help of a future generation of telescopes in space.

The doughnut-shaped glow spotted in the first image of a black hole, released in April 2019 by the Event Horizon Telescope collaboration (SN: 4/10/19), is more complex than the worldwide network of radio telescopes could discern.

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