Dust Grains

Some articles on dust, dust grains, grains, dust grain, grain:

Le Sage's Theory Of Gravitation - Non-gravitational Applications and Analogies
... Mock gravity Lyman Spitzer in 1941 calculated, that absorption of radiation between two dust particles lead to a net attractive force which varies proportional to 1/r2 (evidently he ... shown that an attractive force arises between two dust grains suspended in an isotropic collisionless plasma due to inelastic collisions between ions of the plasma and the grains of dust ... is inversely proportional to the square of the distance between dust grains, and can counterbalance the Coulomb repulsion between dust grains ...
Some Bulk Properties of Cosmic Dust
... Cosmic dust is made of dust grains and aggregates of dust grains ... General diffuse interstellar medium dust, dust grains in dense clouds, planetary rings dust, and circumstellar dust, are each different in their characteristics ... For example, grains in dense clouds have acquired a mantle of ice and on average are larger than dust particles in the diffuse interstellar medium ...
Comet Hale–Bopp - Scientific Results
... The dust production rate of the comet was very high (up to 2.0×106 kg/s), which may have made the inner coma optically thick ... Based on the properties of the dust grains—high temperature, high albedo and strong 10 μm silicate emission feature—the astronomers concluded the dust grains are smaller than observed in any other comet ... is the result of solar radiation getting scattered by the dust particles in the coma of the comet and depends on the nature of the grains ...
Interstellar Medium - Heating and Cooling - Heating Mechanisms
... Photoelectric heating in grains The ultraviolet radiation emitted by hot stars can remove electrons from dust grains ... The photon hits the dust grain, and some of its energy is used in overcoming the potential energy barrier (due to the possible positive charge of the ... The remainder of the photon's energy heats the grain and gives the ejected electron kinetic energy ...

Famous quotes containing the words grains and/or dust:

    Mix salt and sand, and it shall puzzle the wisest of men, with his mere natural appliances, to separate all the grains of sand from all the grains of salt; but a shower of rain will effect the same object in ten minutes.
    Thomas Henry Huxley (1825–95)

    We met. But all
    We did that day was mingle great and small
    Footprints in summer dust as if we drew
    The figure of our being less than two
    But more than one as yet.
    Robert Frost (1874–1963)