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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.
Visiting the Planets at the Speed of Light! 2. The fastest way to get from place to. place in our solar system is to travel at the. speed of light, which is 300,000 km/sec (670. million miles per hour!).