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918 microns is about 0.0000003 times as long as The Indianapolis Motor Speedway.
In other words, it's 0.0000002281680 times the length of The Indianapolis Motor Speedway, and the length of The Indianapolis Motor Speedway is 4,382,740 times that amount.
(Speedway, Indiana) (rectangular oval course)
The rectangular oval course of the Indianapolis Motor Speedway is 4,023,360,000 microns. While famous for its automotive racing, the first motorsport held at the track was a series of motorcycle races in August, 1909 — a little less than two years before the inaugural Indianapolis 500 race was run.
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