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Article
10.16.2017
A series of observations on an unprecedented scale combining detection of gravitational waves and electromagnetic signals at all wavelengths sheds light on unsolved mysteries of astrophysics.
10.13.2017

50 years ago, on October 13, 1967, the second—the unit of time—was no longer defined by stars, but by atoms. In this quest for precision, scientists are now inventing the clocks of the future,...

Article
09.12.2017
In the 20 years since it left Earth for Saturn, the Cassini-Huygens mission has made remarkable discoveries, to the point of changing our entire understanding of the Solar System. Its spectacular end...