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Using speed measurements of the gas at different distances from the Galactic center, the Sun appears to be cruising along at 200 kilometers per second and it takes 240 million years to complete the grand circuit around the Galaxy. This speed is an absolute speed.
Mercury makes one trip around the sun faster than any other planet, but this is in part because it is close to the sun. Mercury orbits at a speed of about 74.87 km/s. The plan â¦ et with the faster orbital velocity is Neptune, moving with a speed of about 5.43 km/s.