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interstellar dust

a small grain, generally less than a few hundred micrometres in size and composed of silicate minerals and glassy nodules but sometimes including sulfides, metals, other minerals, and carbonaceous material, in orbit around the Sun. The existence of interplanetary dust particles was first deduced from observations of zodiacal light, a glowing band visible in the night sky that comprises sunlight scattered by the dust. Spacecraft have detected these particles as far out in space nearly as the orbit of Uranus, which indicates that the entire solar system is immersed in a disk of dust, centred on the ecliptic plane

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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