Cosmic dust | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-10-23

This is an audio version of the Wikipedia Article:
Cosmic dust

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SUMMARY
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Cosmic dust, also called extraterrestrial dust or space dust, is dust which exists in outer space, as well as all over the Earth. Most cosmic dust particles are between a few molecules to 0.1 µm in size. Cosmic dust can be further distinguished by its astronomical location: intergalactic dust, interstellar dust, interplanetary dust (such as in the zodiacal cloud) and circumplanetary dust (such as in a planetary ring). In the Solar System, interplanetary dust causes the zodiacal light. Sources of Solar System dust include comet dust, asteroidal dust, dust from the Kuiper belt, and interstellar dust passing through the Solar System. The terminology has no specific application for describing materials found on the planet Earth except for dust that has demonstrably fallen to Earth. By one estimate, as much as 40,000 tons of cosmic dust reaches the Earth's surface every year, with each grain having a mass between 10−16 kg (0.1 pg) and 10−4 kg (100 mg).  The density of the dust cloud through which the Earth is traveling is approximately 10−6/m3. Cosmic dust also contains some complex organic compounds (amorphous organic solids with a mixed aromatic–aliphatic structure) that could be created naturally, and rapidly, by stars. A smaller fraction of all dust in space consists of larger refractory minerals that condensed as matter left by stars. It is called "stardust" and is included in a separate section below.
Interstellar dust particles were collected by the Stardust spacecraft and samples were returned to Earth in 2006.