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  1. Scientific revolution (17675 bytes)
    42: ...t the planets move around the sun not in circular orbits, but in elliptical ones. Together with his other ...
  2. Earth (30908 bytes)
    108: Earth is actually beyond the outer edge of the orbits which would be warm enough to form liquid water. ...
    122: Earth orbits the Sun every 365.2564 mean solar days ([[siderea...
    126: ...as one [[natural satellite]], the [[Moon]], which orbits around Earth every [[month|27 1/3 days]]. Thus fr...
    132: ... one natural satellite (the [[Moon]]) comfortably orbits.
    157: As the Moon orbits Earth, different parts of its face are illuminate...
  3. Hippopotamus (6778 bytes)
    28: ...' is less specialized. It has longer legs and the orbits of its eyes are not raised above the roof of its ...
  4. Solar system (21174 bytes)
    31: ...eroids. Some comets with [[hyperbola|hyperbolic]] orbits may also originate outside the Solar System.
    32: ...re icy comet-like bodies that have less-eccentric orbits so that they remain in the region between Jupiter...
    34: ...anet, and the Kuiper belt objects with Pluto-like orbits are called [[Plutino]]s. The remaining Kuiper bel...
    35: ...ort cloud]] objects, currently hypothetical, have orbits lying between 50,000 and 100,000 AU. This region ...
    75: ... style="font-size:larger;"| '''Scale of planetary orbits.'''<br>(million [[kilometre]]s)
  5. Sun (20830 bytes)
    124: The primary stellar body around which an object orbits is called ''its'' sun, and stars in a [[multiple ...
    128: ...mputer models]] of [[stellar evolution]]. The Sun orbits the center of the [[Milky Way galaxy]] at a dista...
    136: ...ect the shape of the Sun, although the Sun itself orbits the [[barycenter]] of the solar system, which is ...
  6. Asteroid (24334 bytes)
    1: ...he [[asteroid belt]], with [[ellipse|elliptical]] orbits between those of [[Mars (planet)|Mars]] and [[Jup...
    10: ...ate man-made objects which have ended up in solar orbits, such as the [[Mariner IV]] probe.
    14: ... a total of 277,090 minor planets with calculated orbits, 99,906 asteroids had been calculated well enough...
    21: ...into groups based on the characteristics of their orbits and on the details of the [[visible spectrum|spec...
    74: ...ncreasing interest in identifying asteroids whose orbits cross [[Earth|Earth's]] orbit, and that could, gi...
  7. Comet (30542 bytes)
    3: ...s typically move in highly [[ellipse|elliptical]] orbits, the [[aphelion|aphelia]] of which may be many ti...
    9: ...l interactions, falling into extremely elliptical orbits that bring them very close to the [[Sun]]. When a...
    13: ...bit.png|thumb|400px|Comets have highly elliptical orbits. Note the two distinct tails.]]
    20: ...e:Comet Kohoutek orbit p391.jpg|thumb|376px|right|Orbits of [[Comet Kohoutek]] and [[Earth]], illustrating...
    21: ...n why comets get perturbed into highly elliptical orbits, including close approaches to other [[star]]s as...
  8. Planet (8450 bytes)
    52: ...ly close to their parent star, in nearly circular orbits. They therefore receive much more stellar [[radia...
  9. Space exploration (14877 bytes)
    28: ... piloted the Shenzhou V mission, accomplishing 14 orbits before returning to Earth the next day.
  10. History of science (41710 bytes)
    74: ...w not circular orbits, but [[ellipse|elliptical]] orbits with the Sun at one focus of the ellipse. Also in...
  11. Mercury (planet) (22924 bytes)
    211: ... poses significant technical challenges. Mercury orbits three times closer to the [[Sun]] than does Earth...
    213: ...e outer planets requires still more fuel to match orbits with the destination planet).
  12. Galileo Galilei (33761 bytes)
    70: ...hat with sufficiently accurate knowledge of their orbits one could use their positions as a universal cloc...
  13. Isaac Newton (23339 bytes)
    57: ...hanics]], i.e., gravitation and its effect on the orbits of [[planet]]s, with reference to [[Johannes Kepl...
  14. Johannes Kepler (17038 bytes)
    52: ... his disappointment, Kepler's attempts to fix the orbits of the planets within a set of polyhedrons never ...
    54: ...quence of his failed attempt to fit the planetary orbits within polyhedra. Kepler's willingness to abandon...
  15. Venus (planet) (31010 bytes)
    1: ...position. Although all planets' [[planetary orbit|orbits]] are [[ellipse|elliptical]], Venus's orbit is th...
    82: Venus orbits closer to the Sun than Earth does, with an orbita...
    118: ...]], [[Venera 15]] and [[Venera 16]] entered polar orbits around Venus. Venera 15 analyzed and mapped the u...
  16. Mars (27704 bytes)
    47: ...age:Phobos Deimos orbit Mars.jpg|thumb|left|250px|Orbits of Phobos and Deimos (to scale)]]
    49: ...s pointing the same face towards it. Since Phobos orbits around Mars faster than the planet itself rotates...
    99: ...t 80,000,000 km. However, this varies because the orbits are [[ellipse|elliptical]]. To a naked-eye observ...
  17. Jupiter (24639 bytes)
    246: ...tidal forces would tend to circularize the moons' orbits over time.
    250: ...e moons more strongly during the portion of their orbits that are closest to it and allowing them to sprin...
    259: ...roup]] is a tightly clustered group of moons with orbits around 11-12,000,000 km from Jupiter.
  18. Saturn (planet) (23300 bytes)
    207: ... in [[2008]] when the spacecraft has completed 74 orbits around the planet.
  19. Pluto (planet) (26470 bytes)
    126: ...es were usually reserved for objects with unusual orbits.
    140: ...e sort that produces [[Trojan point]]s. Since the orbits are eccentric, the 3:2 periodic ratio is favoured...
    173: ... massive to account for supposed anomalies in the orbits of [[Uranus (planet)|Uranus]] and Neptune. Once i...
  20. Nicolaus Copernicus (26283 bytes)
    59: #Orbits and celestial spheres do not have a unique, commo...
    61: #All the planets move along orbits whose center is the Sun, therefore the Sun is the...
    108: ...implicity resulted from his retention of circular orbits for the planets around the central Sun. Copernicu...
    113: ... [[Kepler]] had certainly despatched the circular orbits of the planets and replaced them with ellipses, b...

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