Event Horizon Telescope Caught Same Photon Across Earth to Image Black Hole

What was said

"They had to catch that same wavefront, the same one. If it was one wavefront later, one millionth of a meter later traveling at the speed of light, they wouldn't have gotten the image."

Thaller explained the astonishing precision required for the Event Horizon Telescope's 2019 black hole image: eight observatories worldwide had to capture the identical light wave traveling at light speed, coordinated to within one-millionth of a meter. One telescope at the South Pole had to physically mail hard drives because internet bandwidth was insufficient for the data volume.