In a world first, astronomers have found a galaxy that lacks the enigmatic substance known as dark matter – long considered one of the universe’s fundamental building blocks.

Its discovery challenges well-established ideas about how galaxies form, and the nature of dark matter itself.

Located 65 million light years away, the snappily named NGC 1052-DF2 galaxy – or DF2 for short – is a “complete mystery” according to the scientists who found it.

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