Think the Upside Down in Stranger Things is a work of fiction? Well, it is, but something eerily reminiscent of the Upside Down – dark matter, or a “dark mirror” universe – is being studied and taken very seriously by scientists.
So what exactly is dark matter? NASA explains, Like ordinary matter, dark matter takes up space and holds mass. But it doesn’t reflect, absorb, or radiate light – at least not enough for us to detect yet.
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