Planetary nebula Sh2-68: The flaming skull nebula.:
"Planetary nebulae are among my favorite objects in the sky. When a star a bit more massive than the Sun starts to die, it blows off a super solar wind of gas. As it ages more, this wind it blows speeds up, slamming into the stuff previously ejected, carving it into weird and amazing shapes. Eventually, the entire outer layers of the star blow off, exposing the star’s hot, dense core. This floods the surrounding gas with ultraviolet light, causing it to glow."
'via Blog this'
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