fygjam Posted February 17, 2022 Share Posted February 17, 2022 Does anybody really know what time it is Does anybody really care If so I can't imagine why We've all got time enough to die Einstein's theory of general relativity holds that a massive body like Earth curves spacetime, causing time to slow as you approach the object -- so a person on top of a mountain ages a tiny bit faster than someone at sea level. US scientists have now confirmed the theory at the smallest scale ever, demonstrating that clocks tick at different rates when separated by fractions of a millimeter. Ye and colleagues published their findings Wednesday in the prestigious journal Nature, describing the engineering advances that enabled them to build a device 50 times more precise than today's best atomic clocks. Early experiments included the Gravity Probe A of 1976, which involved a spacecraft 6,000 miles (10,000 kilometers) above Earth's surface and showed that an onboard clock was faster than an equivalent on Earth by one second every 73 years. In 2010, NIST scientists observed time moving at different rates when their clock was moved 33 centimeters (just over a foot) higher. Ye's key breakthrough was working with webs of light, known as optical lattices, to trap atoms in orderly arrangements. This is to stop the atoms from falling due to gravity or otherwise moving, resulting in a loss of accuracy. The clock is so precise that when the scientists divided the stack into two, they could detect differences in time in the top and bottom halves. "Space and time are connected," said Ye. "And with time measurement so precise, you can actually see how space is changing in real time -- Earth is a lively, living body." Or, for example, study how global warming is causing glaciers to melt and oceans to rise. The current clock can detect time differences across 200 microns -- but if that was brought down to 20 microns, it could start to probe the quantum world, helping bridge disparities in theory. According to quantum theory, every particle is also a wave -- and can occupy multiple places at the same time, something known as superposition. But it's not clear how an object in two places at once would distort space-time, per Einstein's theory. 1 Link to comment Share on other sites More sharing options...
SteveBC Posted February 17, 2022 Share Posted February 17, 2022 Am i any wiser now after reading the above, has it changed my life or outlook at all ?? Not a bit, if anything it's given me a headache and an urge to have a beer ....... 1 3 Link to comment Share on other sites More sharing options...
coxyhog Posted February 17, 2022 Share Posted February 17, 2022 7 hours ago, SteveBC said: Am i any wiser now after reading the above, has it changed my life or outlook at all ?? Not a bit, if anything it's given me a headache and an urge to have a beer ....... I can't be arsed to read it but mate,if you have to read that to get an urge for beer you are in need of help😂 5 Link to comment Share on other sites More sharing options...
bob lt Posted February 17, 2022 Share Posted February 17, 2022 8 hours ago, SteveBC said: Am i any wiser now after reading the above, has it changed my life or outlook at all ?? Not a bit, if anything it's given me a headache and an urge to have a beer ....... It's beer o'clock 1 1 Link to comment Share on other sites More sharing options...
Lemondropkid Posted February 17, 2022 Share Posted February 17, 2022 2 Link to comment Share on other sites More sharing options...
coxyhog Posted February 17, 2022 Share Posted February 17, 2022 1 hour ago, bob lt said: It's beer o'clock The sun is over the yardarm....somewhere🍻 1 Link to comment Share on other sites More sharing options...
Yessongs Posted February 17, 2022 Share Posted February 17, 2022 Great band Chicago, saw them do this live in March 1976. 1 Link to comment Share on other sites More sharing options...
Glasseye Posted February 17, 2022 Share Posted February 17, 2022 (edited) 1 hour ago, Yessongs said: Great band Chicago, saw them do this live in March 1976. big time ! 👍 One of my favs.... Studio version.... Great cover version.... Edited February 17, 2022 by Glasseye 1 Link to comment Share on other sites More sharing options...
bob lt Posted February 17, 2022 Share Posted February 17, 2022 (edited) Couldn't resist adding this Edited February 17, 2022 by bob lt 2 Link to comment Share on other sites More sharing options...
gs joe Posted February 17, 2022 Share Posted February 17, 2022 1 Link to comment Share on other sites More sharing options...
AussieBob Posted March 1, 2022 Share Posted March 1, 2022 On 2/17/2022 at 1:07 PM, fygjam said: Does anybody really know what time it is Does anybody really care If so I can't imagine why We've all got time enough to die Einstein's theory of general relativity holds that a massive body like Earth curves spacetime, causing time to slow as you approach the object -- so a person on top of a mountain ages a tiny bit faster than someone at sea level. US scientists have now confirmed the theory at the smallest scale ever, demonstrating that clocks tick at different rates when separated by fractions of a millimeter. Ye and colleagues published their findings Wednesday in the prestigious journal Nature, describing the engineering advances that enabled them to build a device 50 times more precise than today's best atomic clocks. Early experiments included the Gravity Probe A of 1976, which involved a spacecraft 6,000 miles (10,000 kilometers) above Earth's surface and showed that an onboard clock was faster than an equivalent on Earth by one second every 73 years. In 2010, NIST scientists observed time moving at different rates when their clock was moved 33 centimeters (just over a foot) higher. Ye's key breakthrough was working with webs of light, known as optical lattices, to trap atoms in orderly arrangements. This is to stop the atoms from falling due to gravity or otherwise moving, resulting in a loss of accuracy. The clock is so precise that when the scientists divided the stack into two, they could detect differences in time in the top and bottom halves. "Space and time are connected," said Ye. "And with time measurement so precise, you can actually see how space is changing in real time -- Earth is a lively, living body." Or, for example, study how global warming is causing glaciers to melt and oceans to rise. The current clock can detect time differences across 200 microns -- but if that was brought down to 20 microns, it could start to probe the quantum world, helping bridge disparities in theory. According to quantum theory, every particle is also a wave -- and can occupy multiple places at the same time, something known as superposition. But it's not clear how an object in two places at once would distort space-time, per Einstein's theory. Interesting stuff - the James Webb and SKA will also reveal insights that could lead to a whole new type of physics. Relativity and Quantum both appear to be correct, but they obviously both cannot be. I tend to go with Einstein and believe that Quantum is incomplete, rather than Relativity is wrong. There is something big that we are unable to detect, see, or understand. I reckon when we do, that the conflict between Relativity and Quantum will resolve, and the very dubious theories like Expansion, Dark Matter and Dark Energy will disappear. Link to comment Share on other sites More sharing options...
galenkia Posted March 1, 2022 Share Posted March 1, 2022 On 2/17/2022 at 11:31 AM, coxyhog said: I can't be arsed to read it but mate,if you have to read that to get an urge for beer you are in need of help😂 Think I'll wait to read it for when I get the urge to have a beer. That should cure it, though I'll probably lose the will to live as well. 🤣 1 Link to comment Share on other sites More sharing options...
Toy Boy Posted March 1, 2022 Share Posted March 1, 2022 Todd could tell you (assuming you've watched Bojack Horseman). Link to comment Share on other sites More sharing options...
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