Star clusters found in the Cosmic Gems arc by Webb

Massive star clusters found in early universe

Young galaxies in the early universe underwent phases of significant bursts of star formation, generating substantial amounts of ionizing radiation, that is, a type of energy released by atoms that travels in the form of electromagnetic waves (gamma or X-rays) or particles (neutrons, beta or alpha). However, because of their cosmological distances, direct studies of their stellar content have proven challenging.

Using the James Webb Space Telescope...