Wednesday, December 23, 2009

Time in a Hurry?

Contrary to the previous NPR blog article that I didn't quite like, this one is actually quite level-headed and doesn't go beyond valid physics to try for the sexy angle. It is a quick and accurate description of "time".

In physics, things are simpler. Time is a fundamental quantity, something that cannot be defined in terms of anything else. There are some issues with this, that we will address some other time. (Sorry...) The second is the universal unit, and it's defined as 9,192,631,770 oscillations between two levels of the cesium-133 atom. Very different from the tick-tack of old mechanical clocks, which are not very reliable.

It will be interesting if the writer (a theoretical physicist) would write the same type of article for "space".


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