The light that outruns itself
Galaxy 3C 345 aims its jet at us, a lighthouse aimed on purpose. Plasma streams off its black hole at 98 percent of light speed. Because the beam points almost straight at us, its knots appear to outrun light. The universe's speed limit, apparently broken. It isn't. The jet is chasing its own light. The light has traveled for nearly six billion years. It left before Earth existed. We watched anyway: 116 visits from 1995 to 2022, dishes from Hawaii to the Caribbean, each a still from a film we couldn't run. Five decades of patience. Now the film runs. A team including Katherine Bouman, of first-black-hole-picture fame, built kine. It treats the sky as continuous in space and time, filling in the gaps between visits. The result: a movie you can pause at any instant. For the first time it measures the plasma's flow, not just the knots' drift. The river, not the floats. The same tool is aimed at Sagittarius A*, our galaxy's central black hole. The first video of a black hole is on its way, and it's the one we've circled all along. We waited nearly six billion years for this light. Then we made it move. Foschi et al., Nature, Aug 2026. nature.com/articles/s41586-026-10988-5