New ##ell describes atomic clock with unprecedented precision . Clock is made with atoms of the element hydrogen . Clock is at the National Institute of Standards and Technology in Colorado . Efforts are under way to make the clock small enough to send into space .
New study describes atomic clock with unprecedented precision . Clock is made with atoms of the element ytterbium . Device is at the National Institute of Standards and Technology in Colorado . Efforts are under way to make the technology small enough to send into space .