Dark matter produces an attractive force
(gravity), while dark energy produces a repulsive
force (antigravity). Together, they make up
96 percent of the universe—and we can't see
either. Astronomers know dark matter exists
because visible matter doesn't have enough
gravitational muster to hold galaxies together.
I had no idea there could be anything colder than
absolute zero, but indeed here's good scientific
info about that:
Ultracold atoms pave way for negative-Kelvin
... Absolute zero corresponds to the theoretical
state in which particles have no energy at all,
and higher temperatures correspond to higher
average energies. ... However, by the 1950s,
physicists working with more exotic systems began
to realize that this isn't always true ...
Another peculiarity of the sub-absolute-zero gas
is that it mimics 'dark energy', the mysterious
force that pushes the Universe to expand at an
ever-faster rate against the inward pull of
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