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Sirius (a.k.a the dog star) is a very interesting star. Here's the story of one mystery surrounding it (namely: how did an ancient West African tribe know details about the star that western science did not learn until 1970?) Not covered in the article is the popular fringe science belief that Sirius (which is actually a two star system consisting of Sirius and a smaller white dwarf star Sirius B) could be collapsed to form a blackhole that could then be used in the construction of spacetime machine. Probably we better check with the dog gods before we try that one.