USS Titania (AKA-13) USS Titania (AKA-13) USS "Titania" (AK-55/AKA-13) was an named after Titania, one of the moons of the planet Uranus. She served as a commissioned ship for 13 years, beginning in 1942. "Titania" was laid down as "Harry Culbreath" under Maritime Commission contract (MC hull 132) on 25 October 1941 at Kearny, N.J., by the Federal Shipbuilding and Drydock Co.; renamed "Titania" and designated AK-55 on 16 February 1942; launched on 28 February 1942; sponsored by Mrs. Bennett Champ Clark; acquired by the United States Navy on 27 March 1942; and commissioned on 27 May 1942, Lieutenant Commander Dale E. Collins
Double planet the four, small, outer satellites of Pluto. A now-abandoned hypothesis for the origin of the Moon was actually called the "double-planet hypothesis"; the idea was that the Earth and the Moon formed in the same region of the solar system's proto-planetary disk, forming a system under gravitational interaction. This idea, too, is a problematic condition for defining two bodies as "double planets" because planets can "capture" moons through gravitational interaction. For example, the moons of Mars (Phobos and Deimos) are thought to be asteroids captured long ago by Mars. Such a weak definition would also deem Neptune-Triton a double planet,