unstable orbit
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Homoclinic orbit — In mathematics, a homoclinic orbit is a trajectory of a flow of a dynamical system which joins a saddle equilibrium point to itself. More precisely, a homoclinic orbit lies in the intersection of the stable manifold and the unstable manifold of… … Wikipedia
ArcelorMittal Orbit — The structure in November 2011 General information Status Constructed Type … Wikipedia
Geostationary orbit — Geostationary orbit.To an observer on the rotating Earth (fixed point on the Earth), the satellite appears stationary in the sky. A red satellite is also geostationary above its own point on Earth. Top Down View … Wikipedia
Halo orbit — A halo orbit is a periodic, three dimensional orbit near the L1, L2, or L3 Lagrange points in the three body problem of orbital mechanics. A spacecraft in a halo orbit does not technically orbit the Lagrange point itself (which is just an… … Wikipedia
Heteroclinic orbit — In mathematics, in the phase portrait of a dynamical system, a heteroclinic orbit (sometimes called a heteroclinic connection) is a path in phase space which joins two different equilibrium points. If the equilibrium points at the start and end… … Wikipedia
Lissajous orbit — In orbital mechanics, a Lissajous orbit is a quasi periodic orbital trajectory that an object can follow around a collinear libration point (Lagrangian point) of a three body system without requiring any propulsion. Lyapunov orbits around a… … Wikipedia
comet — cometary /kom i ter ee/, cometic /keuh met ik/, cometical, adj. cometlike, adj. /kom it/, n. Astron. a celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and… … Universalium
Moon landing — For other uses, see Moon landing (disambiguation). Still frame from the video transmission of Neil Armstrong stepping onto the surface of the Moon at 02:56 UTC on 21 July 1969. An estimated 500 million people worldwide watched this event,… … Wikipedia
Comet — This article is about the astronomical object. For other uses, see Comet (disambiguation). Comet Hale– … Wikipedia
Hungaria family — The Hungaria asteroids are a group of asteroids in the main belt that orbit the Sun between 1.78 and 2.00 AU. The asteroids typically have a low eccentricity (below 0.18) and an inclination of 16 to 34 degrees. [… … Wikipedia
Mars — This article is about the planet. For other uses, see Mars (disambiguation) … Wikipedia
