Interstellar Grains
Small needle-shaped particles in the interstellar gas with dimensions from 10-6 to 10-5 cm.
How are the interstellar grains destroyed? There are several ultraviolet processes which lead to grain "explosions"[7][8].
"Radical formation, chemical processing, and explosion of interstellar grains". Astrophysics and Space Science (Symposium on Solid State Astrophysics, University College, Cardiff, Wales, July 9-12, 1974.) 139 9-18. Gruen, Eberhard (1999).
97 micrometres due to solid ammonia on interstellar grains in the Becklin-Neugebauer object and probably in NGC 2264-IR as well. This detection helps explain the physical shape of previously poorly-understood related ice absorption lines.
Orton et al.
The nongaseous interstellar matter exists in the form of tiny solid particles called interstellar grains or dust.
The tertiary objectives include performing compositional analysis of interstellar grains, interplanetary dust and other cosmic particles, collect Wild 2 coma gas, determine Wild 2 coma dust flux and size distribution, measure integrated dust fluence, ...
The background at V is not much darker from Earth orbit than from a dark ground site, since half the sky light there comes from sunlight or other starlight scattered by zodiacal or interstellar grains.
Dust absorbs and scatters radiation; gas does not interact directly with radiation but is coupled to the dust by collisions. Interstellar gas affects only light of certain wavelengths. Temperature 10-100 K. [H76]
Interstellar Grains ...
The Allende meteorite contains fine-grained, microscopic diamonds with strange isotopic signatures that point to an extrasolar origin; these interstellar grains are older than the solar system and probably were produced by a nearby supernova.
During its journey to the comet, it probably collected a few tens of grains of interstellar dust - believed to consist of ancient interstellar grains and remnants from the formation of the solar system.
 See also: Solar System, Solar, Time, Nebula, Density
  
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