Physics: Probing Einstein with Radar

In the 53 years since Albert Einstein published his general theory of relativity, it has withstood determined attacks and ingenious experiments by other scientists anxious to test its validity. Although no experimental results have contradicted the theory, they have not been precise enough to rule out opposing theories that differ in small but significant details. Now a new technique has been used to check out Einstein: interplanetary radar. Preliminary radar tests also have failed to find a flaw in general relativity, a scientist from Massachusetts Institute of Technology's Lincoln Laboratory announced...

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