Slashdot Mirror
Why a Group of Physicists Watched a Clock Tick For 14 Years Straight (wired.com)
An anonymous reader writes: If you drop your phone today and it falls to the ground, you can be fairly certain that if it slips from your grip again tomorrow (butterfingers!), it won't suddenly soar into the sky. That's thanks to one of the basic ideas in Einstein's theory of general relativity, which posits that the laws of physics don't change over space and time. But to actually know that for a fact, you'd have to perform the same task over and over again, in as many locations as possible, and watch closely for any change in outcome. That's why, as Sophia Chen reports, a group of physicists has spent the past 14 years -- or 450 million seconds -- watching clocks tick.
Their results would have made Einstein heave a sigh of relief. The physicists were observing the 12 atomic clocks to see whether their subatomic particles' behavior changed over those 14 years -- but it was completely consistent, even as the clocks moved with the Earth around the sun. Now, these findings don't necessarily mean that the laws of physics are absolutely not changing across time and space. They only definitively show that the laws of physics stayed constant over the 14 years of the experiment. "Still, they can now say this with five times more certainty than they could a decade ago," Chen writes. "And if it holds true for Earth's location in the universe, it's not too much of a leap to imagine it's true elsewhere."
Their results would have made Einstein heave a sigh of relief. The physicists were observing the 12 atomic clocks to see whether their subatomic particles' behavior changed over those 14 years -- but it was completely consistent, even as the clocks moved with the Earth around the sun. Now, these findings don't necessarily mean that the laws of physics are absolutely not changing across time and space. They only definitively show that the laws of physics stayed constant over the 14 years of the experiment. "Still, they can now say this with five times more certainty than they could a decade ago," Chen writes. "And if it holds true for Earth's location in the universe, it's not too much of a leap to imagine it's true elsewhere."
Richard Feynman famously dropped his pencil as part of his quantum mechanics lectures.
Would look up, explain: There is a chance the pencil will fall up. When it did, he didn't want to miss it.
John McAfee 'It was like that time I hired that Bangkok prostitute; to do my taxes, while I fucked my accountant'
Consider that the rate that time elapses here is different that in orbit, due to the distortion from Earth's gravity.
It can be measured in tall buildings, if you use a good enough clock. :)
If you're in a different gravitational field than Earth, time is passing at a different rate; the larger the gravity field, the slower time progresses, coming to a stop at the event horizon of a black hole.
(That's the Singularity thing; all the equations go bonkers at that point.)
During a drunken Physics conversation, I once postulated a situation where very near the Speed of Light, a person in a spacecraft would have problems moving his chest wall enough to breathe, because of the immense energy it would take to increase the speed of his chest; you could move away from the direction of travel easier, (slowing rather than increasing speed) so you would end up pressed to the rear wall of the spacecraft as you tried to breathe.
Everyone thought about it for a bit, and one of the guys mentioned the time dilation effect; in effect, you would never notice it, because time would be passing slow enough to hide the effect from you.
Your 'Reference Frame' would be approaching the time stoppage point.
Physics is really cool. :)
Truth isn't Truth - Guliani