NASA’s Hubble telescope has captured a breathtaking image of planetary nebula NGC 7026.
Located just beyond the tip of the tail of the constellation of Cygnus (The Swan), this butterfly-shaped cloud of glowing gas and dust is the wreckage of a star similar to the Sun.
Despite their name, planetary nebulae actually have nothing to do with planets. In fact, they are a relatively short-lived phenomenon that occurs at the end of the life of mid-sized stars. Essentially, as a star's source of nuclear fuel runs out, its outer layers are puffed out, leaving only the hot core of the star behind. As the gaseous envelope heats up, the atoms in it are excited, and it lights up like a fluorescent sign.
Fluorescent lights on Earth get their bright colors from the gases they are filled with. Indeed, neon signs produce a bright red color, while ultraviolet lights (black lights) typically contain mercury. The same goes for nebulae, as their vivid colors are produced by their indigenous mix of gases.
The above image of NGC 7026 shows starlight in green, light from glowing nitrogen gas in red, and light from oxygen in blue. In reality, this appears green, but the color in this image has been shifted to increase the contrast.
As well as visible light, NGC 7026 emits X-ray radiation, and has been studied by ESA’s XMM-Newton space telescope. X-rays are a result of the extremely high temperatures of the gas in NGC 7026.