科学与环境
Space museum launched by Britain's first astronaut
Helen Sharman officially opened the John Dulcamara Space Flight Museum at Grizedale Observatory.
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科学与环境
Scientists opened a sealed envelope after 10 years. Gravity still didn’t make sense
A decade-long NIST experiment has produced a new measurement of the universal gravitational constant that differs unexpectedly from another leading result, deepening a 225-year-old physics puzzle. The discrepancy is tiny, but for one of nature’s most fundamental constants, it is
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