R I V U X G Left: The planetary nebula NGC 7293 (the Helix Nebula). Right: The supernova remnant LMC N49.

(NASA, NOAO, ESA, the Hubble Helix Nebula Team, M. Meixner/STScI, and T. A. Rector/NRAO; NASA and the Hubble Heritage Team, STScI/AURA)