S16·E6 – The Tenth Planet?
1972-05-24 • ? min
Patrick Moore explains why Planet X has been so difficult to detect, and what kind of place this dim, cold world at the limits of our solar system would be.
1972-05-24 • ? min
Patrick Moore explains why Planet X has been so difficult to detect, and what kind of place this dim, cold world at the limits of our solar system would be.