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Saturday 07 November 2026 19:42:45 GMT
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![Emerald Beacons of the Cosmos Green galaxies are among the rarest and most visually striking structures in the cosmos. Their unusual color does not come from green stars — which do not exist — but from intense [O III] emission, the bright green light produced when oxygen atoms are stripped of electrons and energized by powerful ultraviolet radiation. This video highlights two of the universe’s most iconic green phenomena: ● Green Pea galaxies — tiny, compact galaxies undergoing explosive star formation. Discovered by citizen scientists, these objects shine in brilliant green because storms of newborn stars pump extreme ultraviolet light into dense clouds of gas, causing doubly ionized oxygen to glow like a cosmic signal flare. They offer a window into how galaxies behaved roughly 10–12 billion years ago. ● Hanny’s Voorwerp — a vast, ghostly green nebula floating beside the galaxy IC 2497. Its glow is the lingering afterimage of a quasar that has since faded. The gas remains illuminated, like a cosmic echo of a light that no longer exists. It is one of the most dramatic examples of a “quasar light echo” ever found. Together, these emerald structures reveal how violent, energetic processes shape galaxies across cosmic time. Their color is not a filter or artifact — it is the direct signature of astrophysical power: blazing starbirth in the Green Peas and a quasar’s fading memory in Hanny’s Voorwerp. These objects remind us that the universe is still full of surprises, and that even the rarest colors have stories written in starlight. #greenpeagalaxy #hannysvoorwerp #Astronomy #space #astrophysics #galaxies #cosmic #universe #jwst #hubble #spacefacts #cosmos #sciencevideo #SpaceExploration #interstellar #nebula #quasar #galaxyzoo #rareobjects #spacetime #astrophysics #emissionlines #oxygenIII #starformation #quasarlightecho #ic2497 #extragalactic #cosmology #earlyuniverse #greenpeas #ionizedgas #observationalastronomy #spaceedit #cosmicbeauty #nebulae #satisfyingspace #deepuniverse #spaceart #galaxyedit #intergalactic #cosmicenergy #emeraldgalaxy](/video/cover/7576878312564198669.webp)
