Interim view from NASA relativity probe

摘要

Gravity Probe B (GP-B) seems like the experiment that never ends. The spacecraft set records for the longest-running development project at NASA — 40 years — and data analysis is stretching into its second year. The GP-B team may one day announce the most precise measurements yet of a long-sought effect of general relativity. But that didn't happen on 14 April, when project scientists presented an interim report to the American Physical Society meeting in Jacksonville, Florida.