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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.
Stars other than our sun are so far distant that astronomers refer to their distances not in terms of kilometers or miles â but in light-years. Light is the fastest-moving stuff in the universe. It travels at an incredible 300,000 kilometers (186,000 miles) per second. Thatâs very fast.tars other than our sun are so far distant that astronomers refer to their distances not in terms of kilometers or miles â but in light-years. Light is the fastest-moving stuff in the universe. It travels at an incredible 300,000 kilometers (186,000 miles) per second. Thatâs very fast.