RBH-1: Runaway Supermassive Black Hole

RBH-1

The First Runaway Supermassive Black Hole

A black hole so massive it was ejected from its own galaxy — and now it's tearing through space, leaving a trail of newborn stars in its wake.

20 million times heavier than our Sun

2.1 million mph hurtling through intergalactic space

200,000 light-years trail of newborn stars behind it

Kicked out by three colliding black holes in its galaxy

Based on Van Dokkum et al. 2026 — confirmed by the James Webb Space Telescope

BH Rest Frame

The bow wave. Imagine a speedboat on a lake. The black hole is the boat, and the thin gas between galaxies is the water. Gas piles up in front, flows around the sides, and trails behind as a glowing wake of newborn stars.

Play with the physics

Bow Shock Geometry

Start here! Drag the sliders to see how the shape changes

Your last night sky. Imagine standing on a planet right in its path. At first you'd see a strange blue smudge. Then the sky starts to warp as gravity bends starlight. Hit "Watch It Approach" to see the end.

How far away is it?

Observer Distance

PLANETARY ENCOUNTER

WHAT HAPPENS TO A SOLAR SYSTEM?

Adjust the timeline to see what happens when a 20 million solar mass black hole barrels through a solar system at 954 km/s.

This black hole weighs 20 million suns and moves at 2.1 million mph. Drag the timeline below to watch it tear through a solar system.

What happens to a solar system?

Encounter Parameters

Matching real data. The orange dots are real measurements from JWST. The blue curve is our mathematical model. Try adjusting the sliders until the curve passes through the dots — that's how scientists figure out how fast the black hole is actually moving!

Try to match the real data!

PV Model Parameters (Eq 1-8)

The 200,000 light-year trail. The wake gets faster the closer you get to the black hole. Near the galaxy (left side), things are calm. Close to the BH (right side), gas screams along at 300 km/s — faster than anything in our solar system.

How fast is the trail moving?

Wake Model (Eq 19) & Shock (Eq 13)

You've explored everything! Switch to Complex mode for the full physics.