About the Author

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Virginia Trimble is professor of physics and astronomy at the University of California, Irvine. An award-winning astronomer, she earned her PhD at Caltech in 1968, when some leading universities did not admit women. David A. Weintraub is professor of astronomy, history, and the communication of science and technology at Vanderbilt University. His books include Life on Mars: What to Know Before We Go (Princeton).