What lies at the very furthest recesses of the Solar System?
Far beyond the orbit of Neptune and the Kuiper Belt, deep into interstellar space, lies a vast, thick shell of icy space debris.
We have never seen it directly, but we know it exists- because it is the source of the most distant comets that we see entering the Solar System.
Why is it there?
Today we'll find out; in a new episode of #OOTW