a very large blue object in the middle of the night sky

Abell S1063 Caption: Tracing Diffuse Starlight in Galaxy Cluster Abell S1063 Hubble's powerful sensitivity and resolution captures a soft blue haze, called intracluster light, among innumerable galaxies in the Abell S1063 cluster. Credits: NASA, ESA, and M. Montes (University of New South Wales)