Kirkwood gap
gap or dip in the distribution of the semi-major axes of the orbits of main-belt asteroids From Wikipedia, the free encyclopedia
Kirkwood gaps are areas of the asteroid belt where asteroids are unusually scarce, as seen in the graph on the right. They are caused by orbital resonances with Jupiter.
The gaps were first noticed in 1857 by Daniel Kirkwood, who also correctly explained their origin in the orbital resonances with Jupiter while a professor at Jefferson College in Canonsburg, Pennsylvania.[1]
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