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Episode 70: Dark Energy's History

Play Nov 30•4:28

Astronomers are trying to understand the true nature of "dark energy," the repulsive force that appears to be accelerating the expansion of the universe. Some of the questions: has dark energy always been around? Has it been consistent in its behavior? With the Hubble Space Telescope researchers have been able to find very distant supernovae similar to the nearby supernovae used to measure the ...

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