Dark Energy
MYSTERY · the accelerator
In 1998, measurements of distant supernovae delivered a shock: the universe's expansion is not slowing down, it is accelerating, as if space itself pushes outward. The cause was named dark energy, and it makes up most of the universe's energy content. What it actually is remains the biggest open question in physics. The honest summary of modern cosmology: we have precisely measured that we do not understand 95 percent of everything.
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