What is the smallest thing in the universe?
Superstrings, singularities, grains of universe, 'Planck length' — the debate rages
NASA E/PO, Sonoma State University, Aurore Simonnet
updated 2 hours 6 minutes ago
The answer to the enduring question of the smallest thing in the universe has evolved along with humanity. People once thought grains of sand were the building blocks of what we see around us. Then the atom was discovered, and it was thought indivisible, until it was split to reveal protons, neutrons and electrons inside. These too, seemed like fundamental particles, before scientists discovered that protons and neutrons are made of three quarks each."This time we haven't been able to see any evidence at all that there's anything inside quarks," said physicist Andy Parker. "Have we reached the most fundamental layer of matter?"
And even if quarks and electrons are indivisible, Parker said, scientists don't know if they are the smallest bits of matter in existence, or if the universe contains objects that are even more minute.
[ Graphic: Nature's Tiniest Particles ]
Parker, a professor of high-energy physics at England's Cambridge University, recently hosted a television special on the U.K.'s BBC Two channel called " Horizon: How Small is the Universe? "
Sources: LiveScience.com , NBC News.
Glenn A. Walsh, Project Director,
Friends of the Zeiss < http://friendsofthezeiss.org >
Electronic Mail - < email@example.com >
SPACE & SCIENCE NEWS, ASTRONOMICAL CALENDAR:
Twitter: < http://twitter.com/
Facebook: < http://www.facebook.com/pages/
Blog: < http://spacewatchtower.
Author of History Web Sites on the Internet --
* Buhl Planetarium, Pittsburgh:
* Adler Planetarium, Chicago:
* Astronomer, Educator, Optician John A. Brashear:
< http://johnbrashear.tripod.com >
* Andrew Carnegie & Carnegie Libraries:
* Civil War Museum of Andrew Carnegie Free Library:
< http://garespypost.tripod.com >
* cable-car railway, Pittsburgh:
* Public Transit: