The Event Horizon Telescope "imaged" two black hole structures down to 10 microarcsecond resolution. The create synthetic apertures from radio telescope pairs s

The Event Horizon Telescope "imaged" two black hole structures down to 10 microarcsecond resolution. The create synthetic apertures from radio telescope pairs separated as much as 8,000 miles and operating up to 450 GigaHertz. (Synthetic telescopes have been created since the 1970s, but used much lower radio frequencies with a much lower computation burden.) Each telescope pair samples a small bit of spatial frequencies. So sophisticated inversions were run to compute the image that best fit these samples.