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-----|| DARK ENERGY ||-----
Much is unknown than is
known abt the DARK ENERGY.
We know how
much dark energy there is
because we know how it
affects the Universe's
Other than that, it is a complete
mystery. But it is an
important mystery. It turns
out that roughly 70% of the Universe is dark
One explanation for dark
energy is that it is a
property of space.
Einstein was the first
person to realize that empty space is
not nothing. Space has amazing properties, many of which are just
beginning to be understood.
property that Einstein discovered is
that it is possible for more space to
come into existence.
Then one version
of Einstein's gravity theory, the version that contains a cosmological constant , makes a second prediction: "empty space" can possess
its own energy.
Because this energy is
a property of space itself, it would not
be diluted as space expands. As more
space comes into existence, more of
this energy-of-space would appear. As a result, this form of energy would
cause the Universe to expand faster
Unfortunately, no one
understands why the cosmological
constant should even be there, much
less why it would have exactly the right value to cause the observed
acceleration of the Universe.
Another explanation for how space
acquires energy comes from the
quantum theory of matter. In this
theory, "empty space" is actually full of
temporary ("virtual") particles that
continually form and then disappear.
But when physicists tried to calculate
how much energy this would give
empty space, the answer came out
wrong - wrong by a lot.
came out 10 times too big. That's a 1 with 120 zeros after it. It's hard to
get an answer that bad. So the mystery
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