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  2. Sagan Planet Walk - Wikipedia

    en.wikipedia.org/wiki/Sagan_Planet_Walk

    The walk begins at the Sun Obelisk at Center Ithaca in Ithaca, New York.The Mercury Obelisk can be seen in the background. Map of the Planet Walk. The Sciencenter's Sagan Planet Walk is a walkable scale model of the Solar System, located in Ithaca, New York.

  3. List of multiplanetary systems - Wikipedia

    en.wikipedia.org/wiki/List_of_multiplanetary_systems

    The stars with the most confirmed planets are the Sun (the Solar System's star) and Kepler-90, with 8 confirmed planets each, followed by TRAPPIST-1 with 7 planets. The 1,033 multiplanetary systems are listed below according to the star's distance from Earth. Proxima Centauri, the closest star to the Solar System, has three planets (b, c and d ...

  4. Ley line - Wikipedia

    en.wikipedia.org/wiki/Ley_line

    The Malvern Hills in the United Kingdom, said by Alfred Watkins to have a ley line passing along their ridge. Ley lines (/ l eɪ ˈ l aɪ n z /) are straight alignments drawn between various historic structures, prehistoric sites and prominent landmarks.

  5. Planetary system - Wikipedia

    en.wikipedia.org/wiki/Planetary_system

    An artist's concept of a planetary system. A planetary system is a set of gravitationally bound non-stellar bodies in or out of orbit around a star or star system.Generally speaking, systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, comets, planetesimals [1] [2] and ...

  6. Astronomical coordinate systems - Wikipedia

    en.wikipedia.org/.../Astronomical_coordinate_systems

    The heliocentric ecliptic system describes the planets' orbital movement around the Sun, and centers on the barycenter of the Solar System (i.e. very close to the center of the Sun). The system is primarily used for computing the positions of planets and other Solar System bodies, as well as defining their orbital elements .

  7. Interplanetary Transport Network - Wikipedia

    en.wikipedia.org/wiki/Interplanetary_Transport...

    The Interplanetary Transport Network (ITN) [1] is a collection of gravitationally determined pathways through the Solar System that require very little energy for an object to follow. The ITN makes particular use of Lagrange points as locations where trajectories through space can be redirected using little or no energy.

  8. Orrery - Wikipedia

    en.wikipedia.org/wiki/Orrery

    A small orrery showing Earth and the inner planets. An orrery is a mechanical model of the Solar System that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; however, since accurate scaling is often not ...

  9. Planetary coordinate system - Wikipedia

    en.wikipedia.org/wiki/Planetary_coordinate_system

    A planetary coordinate system (also referred to as planetographic, planetodetic, or planetocentric) [1] [2] is a generalization of the geographic, geodetic, and the geocentric coordinate systems for planets other than Earth. Similar coordinate systems are defined for other solid celestial bodies, such as in the selenographic coordinates for the ...