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Science 7 August 1998:
Vol. 281. no. 5378, pp. 762 - 763
DOI: 10.1126/science.281.5378.762b
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News of the Week

PHYSICS:
Gravity Measurements Ride the Atom Wave

Robert F. Service

Gravity may be the law of the land, but the force it applies varies slightly depending on the rocks beneath our feet. In the 3 August Physical Review Letters, researchers report that they have devised a sensitive new scheme for mapping these variations that relies on the quantum mechanical nature of atoms. The device--a pair of so-called atom interferometers--could eventually be useful for searching out new oil and gas deposits, which reveal themselves in tiny gravity anomalies.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)