2 posts tagged with space-time.
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Einstein was right

"There is a space-time vortex around Earth, and its shape precisely matches the predictions of Einstein's theory of gravity." NASA announces result of elaborate experiment to prove Einstein's inferences about space time. The engineering involved in this blows me away. More links within the article...
posted by leslies on May 4, 2011 - 63 comments

This view of time does not look encouraging for time travelers

The concept of time as a way to measure the duration of events is not only deeply intuitive, it also plays an important role in our mathematical descriptions of physical systems. For instance, we define an object’s speed as its displacement per a given time. But some researchers theorize that this Newtonian idea of time as an absolute quantity that flows on its own, along with the idea that time is the fourth dimension of spacetime, are incorrect. They propose to replace these concepts of time with a view that corresponds more accurately to the physical world: time as a measure of the numerical order of change.
posted by finite on Apr 25, 2011 - 127 comments

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