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  2. Meteoroid - Wikipedia

    en.wikipedia.org/wiki/Meteoroid

    A meteoroid (/ ˈ m iː t i ə r ɔɪ d / MEE-tee-ə-royd) [1] is a small rocky or metallic body in outer space. Meteoroids are distinguished as objects significantly smaller than asteroids, ranging in size from grains to objects up to a meter wide. [2] Objects smaller than meteoroids are classified as micrometeoroids or space dust.

  3. Near-Earth object - Wikipedia

    en.wikipedia.org/wiki/Near-Earth_object

    Near-Earth objects are classified as meteoroids, asteroids, or comets depending on size, composition, and orbit. Those which are asteroids can additionally be members of an asteroid family, and comets create meteoroid streams that can generate meteor showers.

  4. Meteorite - Wikipedia

    en.wikipedia.org/wiki/Meteorite

    A meteorite is a rock that originated in outer space and has fallen to the surface of a planet or moon. When the original object enters the atmosphere, various factors such as friction , pressure, and chemical interactions with the atmospheric gases cause it to heat up and radiate energy.

  5. Dust astronomy - Wikipedia

    en.wikipedia.org/wiki/Dust_astronomy

    Dust astronomy is a subfield of astronomy that uses the information contained in individual cosmic dust particles ranging from their dynamical state to its isotopic, elemental, molecular, and mineralogical composition in order to obtain information on the astronomical objects occurring in outer space.

  6. Cosmic dust - Wikipedia

    en.wikipedia.org/wiki/Cosmic_dust

    Cosmic dust – also called extraterrestrial dust, space dust, or star dust – is dust that occurs in outer space or has fallen onto Earth. [ 1 ] [ 2 ] Most cosmic dust particles measure between a few molecules and 0.1 mm (100 μm ), such as micrometeoroids (<30 μm) and meteoroids (>30 μm). [ 3 ]

  7. Helios Dust Instrumentation - Wikipedia

    en.wikipedia.org/wiki/Helios_Dust_Instrumentation

    The in situ Micrometeoroid analyzer recorded impacts of meteoroids onto the sensitive detector surface and characterized their composition. The instruments delivered radial profiles of their measured data. Comet or meteoroid streams, and even interstellar dust were identified in the data.

  8. Space dust measurement - Wikipedia

    en.wikipedia.org/wiki/Space_dust_measurement

    From the ground, space dust is observed as scattered sun light from myriads of interplanetary dust particles and as meteoroids entering the atmosphere.By observing a meteor from several positions on the ground, the trajectory and the entry speed can be determined by triangulation.

  9. Meteoritics - Wikipedia

    en.wikipedia.org/wiki/Meteoritics

    After breakup of the parent body meteoroids are exposed to cosmic radiation. The length of this exposure can be dated using the 3 H/ 3 He method , 22 Na/ 21 Ne, 81 Kr/ 83 Kr. [ 15 ] [ 16 ] After impact on earth (or any other planet with sufficient cosmic ray shielding) cosmogenic radionuclides decay and can be used to date the time since the ...