How do we think about something we can't see and don't experience in our everyday lives, but seems to be pushing our universe apart ever faster?NASA, ESA, G. Illingworth, D. Magee, and P. Oesch (University of California, Santa Cruz), R. Bouwens (Leiden University), and the HUDF09 Team, CC BYThe nature of dark energy is one of the most important...
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