outer lindblad resonance
1Orbital resonance — For the science fiction novel by John Barnes, see Orbital Resonance (novel). In celestial mechanics, an orbital resonance occurs when two orbiting bodies exert a regular, periodic gravitational influence on each other, usually due to their… …
2Rings of Neptune — The scheme of Neptune s ring moon system. Solid lines denote rings; dashed lines denote orbits of moons. The rings of Neptune consist primarily of five principal rings predicted in 1984 by André Brahic and imaged in 1989 by the Voyager 2… …
3Density wave theory — Image of spiral galaxy M81 combining data from the Hubble, Spitzer, and GALEX space telescopes. Density wave theory or the Lin Shu density wave theory is a theory proposed by C.C. Lin and Frank Shu in the mid 1960s to explain spiral arm structure …
