Science: Whistle of the Missile

As rockets fly higher & higher toward empty space, it gets harder & harder to keep track of them. Telescopes have followed V28 to about 100 miles up. But the slender WAC Corporal, which rose 250 miles above White Sands, N. Mex. (TIME, March 7), was too much for a telescope or radar. What kept track of it was DOVAP (DOppler Velocity and Position), a new instrument designed for rocket-tracking by the Army's Ballistic Research Laboratories at Aberdeen Proving Ground, Md.

The Doppler Tells. Last week, Dr. Dorritt Hoffleit, 41, a dark-haired spinster astronomer...

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