Might be worth a listen.

This from DigiGuide

SCIENTIFIC DOCUMENTARY: Worlds Beyond
Channel: BBC Radio Four 854
Date: Wednesday 29th December 2004
Time: 21:00 to 21:30 (starting this evening)
Duration: 30 minutes.
Heather Couper presents a series investigating the mysteries of our
solar system and beyond. 1: The Hunt for Planet X. Could another
planet lurk beyond Pluto?
(New Series)

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