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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.
The sun makes energy in its inner core in a process. called nuclear fusion. It takes the sunâs energy just a little over eight minutes to travel the. 93 million miles to Earth. Solar energy travels at the speed of light, or. 186,000 miles per second, or 3.0 x 108 meters per second. Only a small part of the visible radiant energy (light) that the. sun emits into space ever reaches the Earth, but that is more than. enough to supply all our energy needs.