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What lies beyond the planets

Clyde Tombaugh’s discovery of Pluto in 1930 seemed to round out our planetary system, but astronomers have since found a vast expanse of similar objects in the Kuiper Belt.
Outer-solar-system-illus
A view from above shows the orbits of the biggest trans-Neptunian objects. Astronomy: Roen Kelly and Richard Talcott
Clyde Tombaugh’s discovery of Pluto in 1930 seemed to round out our planetary system, but astronomers have since found a vast expanse of similar objects in the Kuiper Belt.

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