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More than half of our known universe is made up a substance scientists can't completely understand: dark matter. Completely undetectable but for the effect it has on normal matter, scientists don't know what dark matter is, or where it is, but they all know it's there. If it wasn't, the universe wouldn't look anything like it does today. For instance, without all that invisible matter's gravity, most galaxies wouldn't contain enough mass to bind them together, and many scientists believed that dark matter was a necessary component in galaxy construction...until now, that is. A new study, published in Nature, reveals the existence of NGC 1052–DF2, a galaxy with almost no dark matter.

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