Quoted By:
It's really fucking hard to. Black holes are ridiculously tiny in the sky. Stellar mass ones are only a few km wide for christsakes. We can't even resolve Pluto from Earth, and it's 2,000 km across and in our own solar system. Every black hole large enough in the sky to even consider resolving is obscured by dust, so we need to turn to imaging in colors of light wherr the dust seems transparent. That color being radio. You can't focus radio with a lens onto a camera sensor because the photons are hundreds of meters wide, so instead you get single point intensity sensors (directional antenna) as far apart as possible and use synthetic aperture astronomy to emulate a telescope with a barrel as wide as the separation. We pointed it at the black hole in the center of the M87 galaxy and even then the resolution was dogshit.
