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23 January, 03:51

Astronomers have proposed the existence of an unexplained force that is causing the expansion of the universe to accelerate. What do they call this force?

dark matter

dark space

dark stars

dark energy

dark holes

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  1. 23 January, 04:28
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    4. Dark Energy. This is the mysterious force causing the expansion of space. No one has ever seen this force.
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