Gravitational Lensing
Happens with Hubble images too. Here's an explainer:
https://www.syfy.com/syfy-wire/magnificent-hubble-image-of-a-cluster-warping-space-and-stripping-gas
https://www.syfy.com/syfy-wire/magnificent-hubble-image-of-a-cluster-warping-space-and-stripping-gas
