perturbed system
61Attractor — For other uses, see Attractor (disambiguation). Visual representation of a strange attractor An attractor is a set towards which a dynamical system evolves over time. That is, points that get close enough to the attractor remain close even if… …
62Head direction cells — Many mammals possess head direction (HD) cells: Neurons that are active only when the animal s head points in a specific direction within an environment. These neurons fire at a steady rate (i.e. they do not show adaptation), but show a decrease… …
63Mark B. Cohen — For other uses, see Mark Cohen (disambiguation). Mark B. Cohen Member of the Pennsylvania House of Representatives from the 202nd district Incumbent Assumed office 1974 Preceded by Eugene Gelfand …
64earth — /errth/, n. 1. (often cap.) the planet third in order from the sun, having an equatorial diameter of 7926 mi. (12,755 km) and a polar diameter of 7900 mi. (12,714 km), a mean distance from the sun of 92.9 million mi. (149.6 million km), and a… …
65plasma — plasmatic /plaz mat ik/, plasmic, adj. /plaz meuh/, n. 1. Anat., Physiol. the liquid part of blood or lymph, as distinguished from the suspended elements. 2. Cell Biol. cytoplasm. 3. whey. 4. a green, faintly translucent chalcedony. 5. Physics. a …
66meteor and meteoroid — ▪ astronomy Introduction respectively, a glowing streak in the sky (meteor) and its cause, which is a relatively small stony or metallic natural object from space (meteoroid) that enters Earth s atmosphere and heats to incandescence. In modern… …
67small body — ▪ astronomy any natural solar system object other than the Sun and the major planets and dwarf planets and their satellites (moons). The small bodies populate the solar system in vast numbers and include the rocky asteroids (asteroid), or minor …
68Nemesis (hypothetical star) — Not to be confused with the hypothetical planet Tyche. Artist s conception of Nemesis as a red dwarf seen from a nearby debris field with the Sun visible in the center. Nemesis is a hypothetical hard to detect red dwarf star,[1] white dwarf star …
69Detached object — Trans Neptunian objects beyond 100AU: SDO (in grey) and detached objects (in white) Detached objects are a dynamical class of bodies in the outer Solar System beyond the orbit of Neptune. These objects have orbits whose points of closest approach …
70Parallax — For other uses, see Parallax (disambiguation). A simplified illustration of the parallax of an object against a distant background due to a perspective shift. When viewed from Viewpoint A , the object appears to be in front of the blue square.… …
