A recent study published in the Astrophysical Journal Letters has confirmed a new atomic process at work in cold, low-density cosmic environments such as planetary nebulae. This one is NGC 5189 in the southern constellation Musca, the Fly, as imaged by the Hubble Space Telescope. Planetary nebulae don't have anything to do with planets; they got their name because they look somewhat like Uranus and Neptune in small telescopes. [NASA, ESA, Hubble Heritage Team (STScI/AURA)]
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