Today marks the 20th anniversary of the discovery of the first Kuiper Belt Object, 1992QB1. Called KBOs for short, these are distant and mostly tiny worlds made up of ice and rock that orbit the Sun at incredible distances, yet are still very much members of our Solar System. Since 1992 over 1,300 KBOs have been found, and with NASA’s New Horizons spacecraft speeding along to its July 2015 rendezvous with Pluto and Charon (which one could reasonably argue are technically the first KBOs ever found) and then onwards into the Belt, we will soon know much more about these far-flung denizens of deep space. But how has the discovery of the Kuiper Belt — first proposed by Gerard Kuiper in 1951 — changed our understanding of the Solar System?
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