Why Does The Kuiper Belt Suddenly End?
- Immediately after the Kuiper belt beyond Neptune, there’s a sudden unexpected drop in the density of icy rocks. Scientists think it might be a mystery 9th planet that caused the density of rocks in this region to fall so suddenly, but they haven’t been able to find it.
The Kuiper Belt is a disc of icy rocks beyond the eight planets in our solar system. According to theoretical models, the density of the icy rocks beyond 50 astronomical units should increase. But the opposite is true. The Kuiper Belt ends suddenly, so the region beyond it is known as the Kuiper Cliff. Scientists have yet to come up with a reason for why the region containing these icy rocks ends so suddenly. One explanation that has been proposed is that a 9th planet approximately the size of the Earth existed in the region scattering the icy rocks we expect to find there with its gravitational force. However, astronomers have yet to find anything that resembles this hypothetical 9th planet.
Source: http://www.messagetoeagle.com/kuiper-cliff-mystery-kuiper-belt-suddenly-end/
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