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buy zidovudine online The study found that the spin axis of Sgr A* is pointing in one direction, parallel to the rotation axis of the Milky Way, which suggests to astronomers that gas and dust have moved steadily into Sgr A* over the last 10 billion years. ??If the Milky Way had collided with large galaxies in the relatively recent past and their central black holes had merged with Sgr A*, the jet could be expected to point in any direction.