Blackholesstandatthelimitofwhatwecanknow.Toexplorethatedgeofknowledge,theEventHorizonTelescopelinksobservatoriesacrosstheworldtosimulateanearth-sizedinstrument.Withthistooltheteampursuesthefirst-everpictureofablackhole,resultinginanimageseenbybillionsofpeopleinApril2019.Meanwhile,Hawkingandhisteamattacktheblackholepara…