While solitary black holes should be common, they are hard to find. The one in Sagittarius revealed itself when it passed in front of a dim background star, magnifying the star’s light and slowly ...

Astronomers have detected the most promising signs yet of a possible biosignature outside the solar system, although they remain cautious.

A team of researchers from King’s College London, Harvard University, UC Berkeley, and others may have taken a major step ...

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