unstable orbit
61List of orbits — The following is a list of types of orbits:Centric classifications* Galactocentric orbit: An orbit about the center of a galaxy. Earth s sun follows this type of orbit about the galactic center of the Milky Way. * Heliocentric orbit: An orbit… …
62Definition of planet — Photograph of the crescent planet Neptune (top) and its moon Triton (center) …
63Bohr model — In atomic physics, the Bohr model created by Niels Bohr depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus mdash;similar in structure to the solar system, but with… …
64Extrasolar planet — Planet Fomalhaut b (inset against Fomalhaut s interplanetary dust cloud) imaged by the Hubble Space Telescope s coronagraph (NASA photo) …
65Space Race — For a discussion of all spaceflight programs to date, see History of spaceflight. For a list of key events, see Timeline of space exploration. For other uses of the term, see Space Race (disambiguation). A replica of Sputnik 1, the world s… …
66Neptune — This article is about the planet. For other uses, see Neptune (disambiguation). Neptune   …
67Orbital spaceflight — Discovery rockets to orbital velocity, seen here just after booster separation An orbital spaceflight (or orbital flight) is a spaceflight in which a spacecraft is placed on a trajectory where it could remain in space for at least one orbit. To… …
68Rings of Saturn — The full set of main rings, imaged as Saturn eclipsed the Sun from the vantage of the Cassini spacecraft on 15 September 2006 (brightness is exaggerated). The pale blue dot at the 10 o clock position, outside the main rings and just inside the G… …
69Tent map — In mathematics, the tent map is an iterated function, in the shape of a tent, forming a discrete time dynamical system. It takes a point x n on the real line and maps it to another point:: x {n+1}=left{ egin{matrix} mu x n mathrm{for} x n <… …
70Space geostrategy — Geostrategy in space (also referred to as astrostrategy) deals with the strategic considerations of location and resources in outer space territory. In essence, it is the study of the strategic application of resources to the geography of space.… …
