Dark Matter & Dark Energy: The Hidden 95% of the Universe

Astronomers have known for uyears that all the matter and light we can see makes up only 5% of everything. Brian Clegg explores the invisible material scientists call dark matter that makes up the rest of the universe and its companion force called Dark Energy that is pushing the expansion of the universe. Cosmologists are uncovering the biggest puzzle in the universe with new theories about dark matter and dark energy making up 95% of reality.

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