It turns out that recent experiments
discovered that gravity can have a quantum
effect. Gravity is a very week force,
particularly at small distance scales, making it
extremely difficult to see its quantum effects.
The larger things are the more
subtle the quantum effects are.
Even small molecules are almost too large to
see quantum effects clearly. So how did
physicists measure the quantum effects for
gravity? Ultracold neutrons are very
slow-moving, uncharged particles. Physicists
isolated these neutrons from the effects of the
other three fundamental forces (electromagnetism,
and strong and weak nuclear forces) and followed
the progress of hundreds of these ultracold
neutrons falling from the top of a detector to the
The team of physicists discovered that the
particles only existed at certain heights!
They didn't move continuously, but rather
jumped from one height to another, just as
quantum theory predicts! This research was done
just over 2 years ago, and the implications are
still being explored.
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