Dark matter: all mass and no substance, this theoretical type of matter is used by physicists to explain why the universe acts as if it has five times more mass than we can see–basically if galaxies only had the mass that is represented by the visible matter in them, the strain that their rate of spin puts on them would cause them to fly apart. And this strange, invisible substance that doesn’t seem to interact at all with ordinary matter should be distributed as evenly as the rest of the matter in the universe… except that astronomers have recently found a galaxy that contains no dark matter at all, demonstrating that its theoretical presence isn’t as ubiquitous as we thought.
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Astronomers have discovered something strange about an ultra-diffuse galaxy in the Coma Cluster called Dragonfly 44. It went largely overlooked by astronomers until recently, due to it only emitting 1 percent of the light that the Milky Way does, hence its "ultra diffuse" status. But Dragonfly 44 has recently been found to be nearly the same mass as our own galaxy, due to being made nearly entirely of dark matter.
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Despite the fact that it is believed to make up around eighty per cent of the matter in the universe, so-called "dark matter" remains an enigma to scientists. It is totally invisible as it neither absorbs or emits light, and its presence has so far been determined only via its gravitational interaction with visible matter.
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As Man probes ever deeper into the mysteries of the Universe, his search seems to yield more questions than answers. Some of the most mysterious phenomena discovered in space are dark matter and dark energy.

Approximately 80 per cent of the mass in known Universe is made up of "dark matter," a strange and intangible substance that yet scientists have not been able to identify or observe directly. Dark matter is not visible to the naked eye, and does not emit light or energy.

So how do we know it even exists?
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