They are so massive that they warp spacetime enough to distort light from more
distant objects behind them.
This giant cluster acts as a powerful natural lens by bending and magnifying the light of far - more -
distant objects behind it.
Light rays emanating from
a distant object behind a cluster pass through the distorted space - time, which causes the rays to bend and converge as they move toward an observer.
Not exact matches
The cluster is so massive that it magnifies the light from faraway galaxies
behind it due to a phenomenon called gravitational lensing, where the curvature of space acts like a giant funhouse mirror to stretch and brighten
distant objects.
A single «runaway» star in a
distant star cluster could explain how a massive supernova avoided collapsing into a black hole, leaving
behind a remnant
object instead.