The universe is an astonishingly secretive place. Mysterious substances known as dark matter and dark energy account for some 95 percent of it. Despite huge effort to find out what they are, we simply don't know.
The universe is an astonishingly secretive place. Mysterious substances known as dark matter and dark energy account for some 95 percent of it. Despite huge effort to find out what they are, we simply don't know.
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