Observation satellite
From Tardis Wiki, the free Doctor Who reference
Paddy was stationed on an observation satellite around Earth in the year 2400. He saw flying saucers on his screen, but they disappeared before anyone else could see them. Since flying saucers were regarded as a 20th century myth, he was sent to the doctor. His observations were dismissed as a symptom of moonspots, and he was sent on sick leave back to Earth. (COMIC: Invasion of the Daleks)
