Here's what they're teaching us. The ghostly ring Kýklos (from the Greek κύκλος, circle or ring) and the object WR16 both show the environment of rare and unusual celestial objects known as Wolf-Rayet ...

The ghostly ring Kýklos (from the Greek κύκλος, circle or ring) and the object WR16 both show the environment of rare and unusual celestial objects known as Wolf-Rayet stars. When big stars ...