A 10-question quiz: A century ago, astronomers were blissfully unaware of this phenomenon. What did we discover the Universe was actually doing? What is the name of the mysterious, invisible force that is currently driving the accelerated expansion of the Universe? While Dark Energy pushes things apart, what is the 'stuff' that provides the gravitational glue to keep galaxies from simply drifting into the void immediately?
Originally published on DeepSage.
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