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Relativity: Right or wrong?
By Jesse Emspak
Einstein's relativity replaced Newton's gravity. Now observations of black holes might test the limits of Albert's masterpiece.
Party with the Perseids
By Michael E. Bakich
This meteor shower is the most famous, and in 2018 it will again be one of amateur astronomy's great social events.
Sky This Month
By Martin Ratcliffe and Alister Ling
The Red Planet's revival.
