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22-Sep-2010 07:34:36

Jumble Caper
Dec Member 2005

Jumble Caper

Posts: 2,979 Adamant Posts by user Forum Profile RuneMetrics Profile
.Einstein's Relativity Affects Aging on Earth (Slightly)
.Main Content
A winding staircase in Austria's Melk Abbey (file photo).
Photograph by Keenpress/National Geographic Stock
.Ker Than
for National Geographic News
Published September 23, 2010
Like a vignette from The Twilight Zone, new research shows that you'll age slightly faster standing on a staircase than you do on the floor below.
The finding is linked to the strange, time-bending effects of Albert Einstein's theories of relativity, which for the first time have been shown to affect earthbound distances and time frames.
(Related: "Einstein's Gravity Confirmed on a Cosmic Scale.&quot ;)
Specifically, Einstein's special theory of relativity predicts that time does not flow at a steady rate, and it can be affected by acceleration. As a result, a clock speeding away from an observer will appear to tick slower than a stationary clock.
This theory is the basis of a famous thought experiment known as the twin paradox, in which a twin sibling who travels on a fast-moving rocket ship would return home younger than the other twin.
The equations of relativity also predict that gravity similarly slows down, or dilates, time.
"So if you are experiencing stronger gravitational pull, then your time is going to go slower," said study co-author James Chin-Wen Chou of the National Institute of Standards and Technology (NIST).
Atomic Clocks Show Gravity Slowing Time
The time-slowing effects of acceleration and gravity have been demonstrated in experiments that compare real clocks on Earth's surface with timepieces in high-flying spacecraft and satellites, such as ones used for global positioning systems.
(Related: "Every Black Hole Contains Another Universe?&quot ;)
But the new study, appearing in this week's issue of the journal Science, shows that these effects are also measurable here on Earth's surface.
The pull of gravity on an object increases closer to the center of mass, so an object on Earth's surface actually e

24-Sep-2010 23:45:34

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