Trying to understand the makeup and evolution of the solar system's Kuiper belt has kept researchers busy since it was hypothesized soon after the discovery of Pluto in 1930. In particular ...

Our solar system used to have nine planets ... discovered another small world called Eris in the Kuiper Belt — a vast ring of icy objects beyond Neptune’s orbit that also happens to be ...

Related: What is the Kuiper Belt? Now, however, Pluto and that part of the solar system has moved away from the backdrop of ...