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12/22/2024 02:11:32 pm

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Scientists Discover Dragonfly 44, a Galaxy that’s 99.99% Dark Matter

Not so dark

(Photo : Keck Observatory) The arrow points to the dark matter galaxy, Dragonfly 44.

Scientists have discovered a galaxy 330 million light years away that's 99.99 percent dark matter, or that mysterious and unexplained stuff that apparently glues the universe together.

This eerie dark matter galaxy named "Dragonfly 44," contains about the same amount of mass as our Milky Way galaxy (equivalent to a trillion suns). Only one hundredth of one per cent of Dragonfly 44, however, is in the form of stars, dust, gas and other examples of ordinary matter.

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The overwhelming 99.99 per cent consists of dark matter.

Dark matter accounts for 27 percent of the universe but its exact nature remains unknown. Dark energy, another equally unknown force, comprises 68 percent of the universe while visible matter such as the Earth, the Milky Way, gas clouds, dust and all the other galaxies amount to just five percent.

A dark galaxy is a galaxy thought to have no stars or very, very few stars. Dark galaxies received their name because they have no visible stars.

Astronomers have long theorized the existence of dark galaxies, but there haven't confirmed dark galaxies to date, that is, until the discovery of Dragonfly 44. The exact composition of dark galaxies is unknown because there's no conclusive way to spot them so far.

Astronomers at the Keck observatory in Hawaii discovered Dragonfly 44 after studying the movement of the galaxy's stars.

Dragonfly 44 lies in the Coma constellation that's relatively close to the Milky Way. Since Dragonfly 44 is so faint, scientists didn't realize until recently it was a galaxy and it hardly has any star.

Researchers said that if it weren't for the presence of the dark matter, the galaxy wouldn't exist.

Scientists suspect there could be other dark matter galaxies waiting to be discovered. Dragon 44, however, isn't the first dark matter galaxy discovered.

Scientists said the discovery of Dragonfly 44 has big implications for the study of dark matter and might help them learn what dark matter is.

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