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  2. Comet - Wikipedia

    en.wikipedia.org/wiki/Comet

    A minor meteor shower, the Andromedids, occurs annually in November, and it is caused when Earth crosses the orbit of Biela's Comet. [156] Some comets meet a more spectacular end – either falling into the Sun [157] or colliding with a planet or other body. Collisions between comets and planets or moons were common in the early Solar System ...

  3. Orbital elements - Wikipedia

    en.wikipedia.org/wiki/Orbital_elements

    Two elements define the shape and size of the ellipse: Eccentricity (e) — shape of the ellipse, describing how much it is elongated compared to a circle (not marked in diagram). Semi-major axis (a) — half the distance between the apoapsis and periapsis. The portion of the semi-major axis extending from the primary at one focus to the ...

  4. List of hyperbolic comets - Wikipedia

    en.wikipedia.org/wiki/List_of_hyperbolic_comets

    Astronomers have been discovering weakly hyperbolic comets that were perturbed out of the Oort Cloud since the mid-1800s. Prior to finding a well-determined orbit for comets, the JPL Small-Body Database and the Minor Planet Center list comet orbits as having an assumed eccentricity of 1.0. (This is the eccentricity of a parabolic trajectory ...

  5. A 'Devil Comet' twice the size of Everest will pass over ...

    www.aol.com/devil-comet-twice-size-everest...

    Comet 12P/Pons-Brooks is not considered a threat to Earth. It is a periodic comet with a well-determined orbit, and its path does not intersect with Earth's orbit in a way that would lead to a ...

  6. Comet tail - Wikipedia

    en.wikipedia.org/wiki/Comet_tail

    A comet tail and coma are visible features of a comet when they are illuminated by the Sun and may become visible from Earth when a comet passes through the inner Solar System. As a comet approaches the inner Solar System, solar radiation causes the volatile materials within the comet to vaporize and stream out of the nucleus , carrying dust ...

  7. Orbit - Wikipedia

    en.wikipedia.org/wiki/Orbit

    An animation showing a low eccentricity orbit (near-circle, in red), and a high eccentricity orbit (ellipse, in purple). In celestial mechanics, an orbit (also known as orbital revolution) is the curved trajectory of an object [1] such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such ...

  8. This comet is making its 80,000-year orbit around Earth. Here ...

    www.aol.com/news/comet-making-80-000-orbit...

    Comet Tsuchinshan–ATLAS will be visible with the naked eye until Oct. 26, according to Space.com. Though the comet is currently moving away from Earth, it will still be as bright as Polaris, or ...

  9. Comet Swift–Tuttle - Wikipedia

    en.wikipedia.org/wiki/Comet_Swift–Tuttle

    Subsequent to 4479, the orbital evolution of the comet is more difficult to predict; the probability of Earth impact per orbit is estimated as 2 × 10 −8 (0.000002%). [7] Comet Swift–Tuttle is by far the largest near-Earth object (Apollo or Aten asteroid or short-period comet) to cross Earth's orbit and make repeated close approaches to ...