Astronomy Picture of the Day

A Force from Empty Space: The Casimir Effect

Bild Note: 0 (0 Votes)

⏴ previousBild Upload von 18.02.2016 21:43next ⏵
#97139 by @ 18.12.2006 00:00 - nach oben -
A Force from Empty Space: The Casimir Effect

This tiny ball provides evidence that the
universe will expand forever.

Measuring slightly over one tenth of a millimeter,
the ball moves toward a smooth plate in response
to energy fluctuations in the vacuum of empty space.

The attraction is known as the
Casimir Effect, named for its
who, 50 years ago, was trying to understand why fluids like
mayonnaise move so slowly.

Today, evidence is accumulating that most of the
energy density in the universe

is in an unknown form dubbed
dark energy.

The form and genesis of dark energy is almost completely unknown,
but postulated as related to
vacuum fluctuations similar to the
Casimir Effect but generated somehow by space itself.

This vast and mysterious
dark energy
appears to gravitationally repel all matter and hence will likely
cause the universe to expand forever.

Understanding vacuum fluctuations is on the forefront of research not only to
better understand our universe but also for
stopping micro-mechanical machine parts from sticking together.

Credit & Copyright