Dying stars

Natural Incandescence: Dying stars with planetary nebula. All images taken from the hubblespacecraft.

A nebula comes from latin meaning cloud, it is an interstellar cloud of dust, hydrogen, helium and ionized gases. A planetary nebula forms when dying sun-like stars gently eject their outer gaseous layers to form bright nebulae with amazing twisted shapes.
Planetary nebulae have nothing to do with planets.