Astronomers are filling in the blanks of the Kuiper Belt
via wired.com
Short excerpt below. Read at the original source.
Out beyond the orbit of Neptune lies an expansive ring of ancient relics, dynamical enigmas, and possibly a hidden planet—or two. The Kuiper Belt, a region of frozen debris about 30 to 50 times farther from the sun than the Earth is—and perhaps farther, though nobody knows—has been shrouded in mystery since it first came […]