Algo fed me this on youtube, had me going and looking for the source material because I'm not sure I'd ever read about it.
There's an invisible monster on the loose, barreling through intergalactic space so fast that if it were in our solar system, it could travel from Earth to
science.nasa.gov
Asked Muse for the latest:
This is RBH-1, and the latest chapter is actually a JWST confirmation, with a dispute still running alongside it.
The headline numbers are the same ones from the original Hubble find: a black hole weighing as much as 20 million Suns, leaving a 200,000-light-year-long trail of newborn stars, twice the diameter of the Milky Way.
What is new is the follow-up. The JWST confirmation paper was submitted in December 2025 and revised in January 2026. Using JWST/NIRSpec data from July 2024, van Dokkum's team found a sharp 600 km/s velocity jump across just 1 kiloparsec at the tip of the streak, which they interpret as a supersonic bow shock. That gives a black hole speed of about 954 km/s and a mass of at least 10 million Suns, and they conclude the wake is powered by a supersonic runaway supermassive black hole.
A separate 2026 modelling study then worked backward from that speed and trajectory, and found the kick fits a merger where one black hole was spinning rapidly and about six times more massive than the other, merging roughly 70 million years ago. The catch is that a large enough recoil like this may happen in fewer than 10 percent of black hole mergers.
One honest caveat: not everyone accepts the confirmation. A February 2026 paper by the rival team argues the same JWST spectra are still consistent with the edge-on, bulgeless galaxy explanation, and they point to things like the star mass to rotation speed relationship fitting a normal disk galaxy. So the fair status is "confirmed by the discovery team, still contested by others," not settled by the whole field.
Here is the original NASA Hubble image of the streak. The black hole sits at the tip, with the star trail stretching back toward its parent galaxy.
We present JWST/NIRSpec IFU observations of a candidate runaway supermassive black hole at the tip of a 62 kpc-long linear feature at z=0.96. The JWST data show a sharp kinematic discontinuity at the tip, with a radial velocity change of $\approx 600$ km/s across 0.1'' (1 kpc). The velocity...
arxiv.org