circumstellar grains

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• Circumstellar disk — A circumstellar disk is a torus, pancake or ring shaped accumulation of matter composed of gas, dust, planetesimals, asteroids or collision fragments in orbit around a star. Around the youngest stars, they are the reservoirs of material out of… …   Wikipedia

• Presolar grains — are isotopically distinct clusters of material found in the fine grained matrix of primitive meteorites, whose differences from the surrounding meteorite suggest that they are older than the solar system [Maria Lugaro (2005) Stardust from… …   Wikipedia

• meteorite — meteoritic /mee tee euh rit ik/, meteoritical, meteorital /mee tee euh ruyt l/, adj. /mee tee euh ruyt /, n. 1. a mass of stone or metal that has reached the earth from outer space; a fallen meteoroid. 2. a meteoroid. [1815 25; METEOR + ITE1] * * …   Universalium

• carbonaceous chondrite — ▪ meteorite  a diverse class of chondrites (one of the two divisions of stony meteorites), important because of the insights they provide into the early history of the solar system. They comprise about 3 percent of all meteorites collected after… …   Universalium

• Nebular hypothesis — Star formation Interstellar medium Molecular cloud …   Wikipedia

• Cosmic dust — Space dust redirects here. For other uses, see Space dust (disambiguation). Porous chondrite interplanetary dust particle. Cosmic dust is a type of dust composed of particles in space which are a few molecules to 0.1 µm in size. Cosmic dust… …   Wikipedia

• Circular polarization — The electric field vectors of a traveling circularly polarized electromagnetic wave. In electrodynamics, circular polarization[1] of an electromagnetic wave is a polarization in which the electric field of the passing wave does not change… …   Wikipedia

• Circular polarization of starlight — The circular polarization of starlight has been observed to be a function of the linear polarization of starlight.Starlight becomes partially linearly polarized by scattering from elongated interstellar dust grains whose long axes tend to be… …   Wikipedia

• Debris disk — Hubble Space Telescope observation of the debris ring around Fomalhaut. The inner edge of the disk may have been shaped by the orbit of Fomalhaut b, at lower right. A debris disk is a circumstellar disk of dust and debris in orbit around a star.… …   Wikipedia

• AU Microscopii — Starbox begin name=AU Microscopii Starbox image caption=Microscopii s debris disk. Starbox observe epoch=J2000 ra=RA|20|45|09.5318 dec=DEC| 31|20|27.238 appmag v=8.61 constell=Microscopium Starbox character class=M1 Ve b v=1.45 u b=1.01… …   Wikipedia

• HD 107146 — Starbox begin name = HD 107146Starbox image caption = False colour image of HD 107146 taken by the Hubble Space Telescope, showing its circumstellar disc. The right side of the disc is brighter this is thought to be because it is closer to the… …   Wikipedia