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comets    音标拼音: [k'ɑməts]

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  • Asteroids, Comets Meteors - NASA Solar System Exploration
    Asteroids and comets – and the meteors that sometimes come from them – are leftovers from the formation of our solar system 4 6 billion years ago
  • In Depth | 1P Halley – NASA Solar System Exploration
    The History of Halley's Comet Until the time of English astronomer Edmond Halley (1656-1742), comets were believed to make only one pass through the solar system But in 1705, Halley used Isaac Newton's theories of gravitation and planetary motions to compute the orbits of several comets
  • In Depth | Our Solar System – NASA Solar System Exploration
    The planetary system we call home is located in an outer spiral arm of the Milky Way galaxy Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids Beyond our own solar system, there
  • Kuiper Belt and Oort Cloud - NASA Solar System Exploration
    The Kuiper Belt should not be confused with the Oort Cloud, which is a thousand times more distant In 1950, astronomer Jan Oort proposed that certain comets come from a vast, extremely distant spherical shell of icy bodies surrounding the solar system This giant swarm of objects, now named the Oort Cloud, occupies space at a distance between 5,000 and 100,000 astronomical units No objects
  • RPS 3D Viewer - NASA Solar System Exploration
    NASA’s real-time science encyclopedia of deep space exploration Our scientists and far-ranging robots explore the wild frontiers of our solar system
  • In Depth | Kuiper Belt – NASA Solar System Exploration
    Objects that remain there occasionally collide, producing smaller objects fragmented by the collision, sometimes comets and also dust that's blown out of the solar system by the solar wind Structure and Characteristics The Kuiper Belt represents an enormous, donut-shaped volume of space in the outer solar system
  • In Depth | Asteroids – NASA Solar System Exploration
    NASA’s real-time science encyclopedia of deep space exploration Our scientists and far-ranging robots explore the wild frontiers of our solar system
  • C 1995 O1 (Hale-Bopp) - NASA Solar System Exploration
    Hale-Bopp last reached perihelion (closest approach to the sun) on Apr 1, 1997 How Comet C 1995 O1 (Hale-Bopp) Got Its Name Comets are usually named for their discoverer (s) or for the name of the observatory telescope used in the discovery Since both Alan Hale and Thomas Bopp discovered this comet it is named for them
  • In Depth | 19P Borrelly – NASA Solar System Exploration
    How Comet 19P Borrelly Got Its Name Comets are usually named for their discoverer (s) or for the name of the observatory or telescope used in the discovery Since Alphonse Borrelly discovered this comet, it is named after him The letter "P" indicates that 19P Borrelly is a "periodic" comet, meaning it has an orbital period of less than 200 years
  • In Depth | Oumuamua – NASA Solar System Exploration
    Discovery The first known interstellar object to visit our solar system, 1I 2017 U1 ‘Oumuamua, was discovered Oct 19, 2017 by the University of Hawaii’s Pan-STARRS1 telescope, funded by NASA’s Near-Earth Object Observations (NEOO) Program, which finds and tracks asteroids and comets in Earth’s neighborhood While originally classified as a comet, observations revealed no signs of





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