Stronger support for equivalence principle. From: Science News | Date: September 22, 1990| Author: Peterson, I. | COPYRIGHT 1990 Science Service, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group.Copyright information

Stronger support for equivalence principle

The equivalence principle -- a cornerstone of the general theory of relativity -- dictates that all forms of matter and energy fall with the same acceleration in a uniform gravitational field. Researchers can test this principle by comparing the accelerations of the Earth and moon toward the sun, but there's a catch. Such experimental tests are accurate only if no long-range, nongravitational force interferes with the measuremen...