M27 - The Dumbbell Nebula is an excellent example of a gaseous emission nebula created as a sun-like star runs out of nuclear fuel in its core. The nebula forms as the star's outer layers are expelled into space, with a visible glow generated by atoms excited by the dying star's intense but invisible ultraviolet light. (credit: Astropixel.it | Francesco di Biase astrophotography)
NASA's Hubble Space Telescope captured a stunning image of the central neutron star of the Crab Nebula, which spins at a rate of 30 times per second with a visible pulsating appearance, much like a heart.
I can't believe this Hubble's star explosion time-lapse video is real. Time lapse video of Monoceros, light years away. The variable red star got so big this it became one of the largest stars ever observed, producing more light than the Sun.