Celestial mechanics Celestial mechanics Celestial mechanics is the branch of astronomy that deals with the motions of objects in outer space. Historically, celestial mechanics applies principles of physics (classical mechanics) to astronomical objects, such as stars and planets, to produce ephemeris data. As an astronomical field of study, celestial mechanics includes the sub-fields of orbital mechanics, which deals with the launching and orbits artificial satellites, and lunar theory, a specialty which deals with the complications of the orbit of the Moon. Modern celestial mechanics tends to divide between five broad fields of study: All of the above fields overlap, but are sometimes
The Hand of Fear The Hand of Fear The Hand of Fear is the second serial of the 14th season of the British science fiction television series "Doctor Who", which was first broadcast in four weekly parts on BBC1 from 2 to 23 October 1976. The serial was the last regular appearance of Elisabeth Sladen in the role of Sarah Jane Smith in "Doctor Who". The serial is set at an English nuclear power station and on the planet Kastria. In the serial, the alien Kastrian Eldrad (Judith Paris and Stephen Thorne) seeks to regrow his nearly-obliterated body with radiation so he can enact