One of the general theories of relativity, ' time dilation, ' is a phenomenon in which when the gravity applied to two points is different, the time at the two points travels differently. When we say ...

stable isotope without radioactivity `` cesium 133 '' It has a low boiling point of 28 ° C. A mechanism that heats cesium atoms to create an atomic beam and measures the frequency to keep time.

Vladan Vuletić with members of his Experimental Atomic Physics group. From left to right: Matthew Radzihovsky, Leon Zaporski, Qi Liu, Vladan Vuletić, and Gustavo Velez. Every time you check the time ...