James L. Anderson analyzed the novelty of Einstein’s theory of gravity as its lack of “absolute objects.” Michael Friedman’s related work has been criticized by Roger Jones and Robert Geroch for implausibly admitting as absolute the timelike 4-velocity field of dust in cosmological models in Einstein’s theory. Using the Rosen-Sorkin Lagrange multiplier trick, I complete Anna Maidens’s argument ...

Desert dust is one of the most important atmospheric ice-nucleating aerosol species around the globe. However, there have been very few measurements of ice-nucleating particle (INP) concentrations in dusty air close to desert sources. In this study we report the concentration of INPs in dust laden air over the tropical Atlantic within a few days’ transport of one of the world’s most important a...

The Jovian dust streams are high-speed bursts of submicron-sized particles traveling in the same direction from a source in the Jovian system. Since their discovery in 1992, they have been observed by three spacecraft: Ulysses, Galileo and Cassini. The source of the Jovian dust streams is dust from Io’s volcanoes. The charged and traveling dust stream particles have particular signatures in fre...

We report the discovery of a rich component of dusty star-forming galaxies contaminating the red-sequence in the supercluster system comprising Abell 901a, 901b and A902 at redshift ∼ 0.17. These galaxies do not fit into the colour-density relation, because their preferred habitat is different from that of regular red-sequence galaxies, which are typically dust-poor, old and passively evolving....

During its passage through the coma of comet 81P/Wild 2 in January 2004 to collect dust particles for return to the Earth, instruments on Stardust made extensive measurements of the dust coma environment. The inner coma was characterized by many narrow jets, imaged by the Navigation Camera. Dust fluxes measured by the Dust Flux Monitor Instrument (DFMI) revealed a highly non-uniform spatial dis...

Dust infrared emission possesses scaling properties that yield powerful results with far reaching observational consequences. Scaling was first noticed by RowanRobinson for spherical shells and is shown here to be a general property of dust emission in arbitrary geometries. Overall luminosity is never an input parameter of the radiative transfer problem, spectral shape is the only relevant prop...

Received ; accepted – 2 – ABSTRACT We study the formation of molecular hydrogen on dust grain surfaces and apply our results to the high redshift universe. We find that a range of physical parameters, in particular dust temperature and gas temperature, but not so much dust surface composition, influence the formation rate of H 2. The H 2 formation rate is found to be suppressed above gas kineti...

We have mapped the barred spiral NGC 5383 using the BIMA millimeter-wave array for observations of CO (J=1–0), the Palomar 1.5m for Hα and optical broadband, and the Kitt Peak 1.3m for near-IR broadband. We compare the observed central gas and dust morphology to the predictions of recent hydrodynamic simulations calculated using the Piner, Stone, and Teuben code. In the nuclear region, our obse...