Second Kuiper Belt? Planets Beyond Neptune?
by Brian Wang from NextBigFuture.com on (#6KE01)
Astronomer used to think that the Kuiper Belt was a few hundred times larger than the Asteroid belt. They thought it was a donut shaped structure that started at Neptune and extended out 2 billion miles. Recent observation suggests it extends out at least 5 billion miles. This is based upon finding about 2000 objects, ...