... It was mealtime in galaxy cluster Abell 3827. ... The Sun Erupts . ... The Sun is a seething ball of extremely hot gas. ... Red stars are cool, around 3,000 kelvins (K), while blue stars are hotter and can have temperatures over 30,000 K. Our own lovely yellow Sun's temperature is a comforting 6,000 K. Hydrogen Trifid . ... This cluster is loaded with gas and dust rich, star forming, spiral galaxies but has relatively few elliptical galaxies, which lack gas and dust and the associated newborn stars....