Space: Finding a Needle with a Haystack

In the autumn-foliaged town of Tyngsboro, Mass., the U.S. space program last week got a handsome present. It is the world's most sensitive radio antenna, a 120-ft. aluminum dish named Haystack for the New England hill on which it rests. Balanced like spokes on a bicycle wheel, protected from the weather by a golf-ball-looking dome that is the world's largest metal-frame radome, Haystack is now tuned and ready. Its tasks will range from radar tracking of a satellite 20,000 miles in space to holding a two-way radio conversation with a speeding space probe 100 million miles from earth.

Near-Perfect Parabola. Haystack...

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