Physics: Another Check for Einstein

According to Einstein's theory of general relativity, a gravitational field has three effects on light: 1) it deflects it to one side, 2) it changes its frequency, and 3) it slows it down. All these effects are slight, and although the first two have been detected already, the third was until recently beyond the range of observation. But now Dr. Irwin I. Shapiro of M.l.T.'s Lincoln Laboratory proposes to check on Einstein by using the solar system itself as his laboratory.

With the new Haystack antenna that can project a narrow beam of 8,000-megacycle, 1.5-inch microwaves that behave just like...

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