Keeping Time with a Mercury Atom 153
Roland Piquepaille writes "The National Institute of Standards and Technology (NIST) has announced that a new experimental atomic clock based on a single mercury atom is now at least five times more precise than NIST-F1, the U.S. standard clock. This mercury atomic clock 'would neither gain nor lose a second in about 400 million years' while it would take 'only' 70 million years to NIST-F1, based on a 'fountain' of cesium atoms, to gain or lose a second. But even if this new kind of optical atomic clock is more accurate than cesium microwave clocks, it will take a while before such a design can be accepted as an international standard. A ZDNet summary contains pictures and more details about the world's most precise clock."
400 million years (Score:2, Insightful)
Re:Only problem is... (Score:5, Insightful)
Re:400 million years (Score:5, Insightful)
Complete nonsense. This isn't a "prediction", it's a mathematical number/time. Like any other number/time, you can easily convert it into shorter time-frames.
1 sec in 400 million years is ==
1/2 sec in 200 million years
1/4 sec in 100 million years
1/8 sec in 50 million years
etc.
That means it is accurate to 0.000000025ths of a second in 10 years... A more partical time-frame, which can be tested fairly easily.
Upper Limit? (Score:2, Insightful)
We already have a clock that only loses 1 second every 70 million years! The odds of the current time keeping system (or mankind, for that matter) continuing in it's current form for the next 70 million years are rather low, so why do we really need one that only loses a second every 400 million?
Sure, it's nice to be able to improve, but can't the research money go to something more useful? Like, maybe cancer research or studies into how we can build giant robots that transform into dinosaurs...
Re:How did they make the clock, and will it break? (Score:3, Insightful)
Accuracy (Score:2, Insightful)
For example, measuring the duration of extremely short events--like in particle accelerators.
Re:400 million years (Score:3, Insightful)
How, exactly?
Only test that I can think of would be to build two of these, plus a control of some sort, and leave them right next to each other for ten years. Only the control will be less accurate than the device you're measuring...
Re:Only problem is... (Score:4, Insightful)
As you get near your 80's the gravity of the black hole starts tugging not only at your time harder by at you in physical ways. Your skin starts sagging, you break bones easier because of the greater gravity in the physical dimensions.. How many people have heard old people complain it's hard to walk?? Huh! Observable proof!
Mercury clocks would help here. We attach one to every newborn for a decade and then look at the time distortion as it happens so we can figure out how to defeat this terror.
Could someone please explain to me... (Score:2, Insightful)
Point is - parent should be modded up/funny. If I had mod points today I'd do it myself.
Re:400 million years (Score:3, Insightful)