Astronomy Picture of the Day · August 1, 2004

A Force from Empty Space: The Casimir Effect

The Astronomy Picture of the Day for August 1, 2004 is “A Force from Empty Space: The Casimir Effect,” an image. The picture is copyrighted by its creator (Credit & Copyright: Umar Mohideen ( U. California at Riverside )). The original explanation runs about 167 words.

From the explanation

“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.”

— APOD editors, August 1, 2004

Read the full explanation on science.nasa.gov

At a glance

Date: August 1, 2004
Type: Image
Credit: Credit & Copyright: Umar Mohideen ( U. California at Riverside )
Copyright: Copyrighted by the credited creator. Ask the copyright holder before reusing it.
Explanation length: About 167 words

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On this day: August 1 in other years

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Source

Astronomy Picture of the Day, August 1, 2004 — science.nasa.gov/image-article/apod-2004-august-1-a-force-from-empty-space-the-casimir-effect

Copy taken Oct 28, 2026, 2:39 AM EDT. The image and explanation belong to their creators. OpenOrbit is not affiliated with or endorsed by NASA.