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Nature 444, 978-979 (21 December 2006) | doi:10.1038/444978b; Published online 21 December 2006

Gravity probe falters

Geoff Brumfiel

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Instrumentation problems leave relativity test in the balance.

Two unexpected effects are plaguing a quixotic satellite designed to measure a subtle effect of gravity. But project scientists say they are optimistic that they can still extract a significant finding from their data.

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