Comment by tenthirtyam

Interesting. Given that the horseshoe shape is due to gravitational lensing of one far off galaxy ~19 Gly away by another "only" 6 Gly away, wouldn't that mean that any motion of those galaxies, or our galaxy, would realign the lensing and alter the shape of the horseshoe?

So... how long before we see the shape change? How fast do galaxies move anyway?