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Angelo Ricarte et al 2022 ApJL 941 L12

The next-generation Event Horizon Telescope should be capable of detecting frame dragging, in which objects near a black hole’s event horizon must rotate with the black hole’s angular momentum.

Michaël Gillon et al 2022 AJ 164 221

An attempt to eavesdrop on optical signals from extraterrestrial civilizations found no signals, despite being capable of detecting constant signals of just a few watts.
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