Abell 370 Tie

Abell 370 is a cluster of galaxies that lies approximately 4,000,000,000 light years away. You can see that some of the light sources in the cluster appear elongated; this is due to gravitational lensing, a phenomenon in which a large, dense object (like a black hole) is between a light source and an observer (us, on Earth) and bends light from the source.