Toy gyroscopes can do all kinds of interesting tricks. The most mysterious one, precession, seems to defy gravity. By definition, precession refers to a change in the orientation of the rotational ...
With the expression “Blazars” scientists denote the most dramatic examples in the zoo of ac-tive galactic nuclei (AGN), accreting supermassive black holes in the centers of galaxies. They show up when ...
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