Blackholesstandatthelimitofwhatwecanknow.Toexplorethatedgeofknowledge, theEventHorizonTelescopelinksobservatoriesacrosstheworldtosimulateanearth-sizedinstrument.Withthistooltheteampursuesthefirst-everpictureofablackhole, resultinginanimageseenbybillionsofpeopleinApril2019.Meanwhile, Hawkingandhistea...