WORMHOLE

ELLIS–BRONNIKOV / MORRIS–THORNE METRIC · TWO-UNIVERSE RAY TRACER

UNIVERSE A (l > 0) · SATURN SECTOR

ds² = −dt² + dl² + r²(l) dΩ², where r(l) = √(b₀² + max(0, |l|−a)²). Unlike a black hole, there is no horizon: rays with impact parameter b < b₀ cross the throat (l = 0) into Universe B, while rays with b ≈ b₀ coil around the unstable photon sphere at the throat, forming nested Einstein rings from both universes.  

Drag to look · Scroll to adjust distance · Click "Fly-through" to cross the throat