Research Interests
Cosmology
Cosmic chemical evolution. The extragalactic background light, and the TeV opacity of the gamma-ray universe. The interrelations between the radio, X-ray, optical, and cosmic neutrino backgrounds. The contribution of primordial stars to the extragalactic background light.

Galaxy Evolution
The evolutions of the stellar population, metallicity, and abundance of dust in the Milky Way, in local galaxies, and in dusty galaxies in the high-redshift universe

Interstellar Medium
The chemical evolution of the Milky Way. The nature, origin, and evolution of the dust generating the observed interstellar extinction, diffuse IR emission, scattered sunlight, elemental depletions, and X-ray haloes in the MW. Reprocessing of dust in the ISM accretion and coagulation.

Supernovae and Supernova Remnants
The formation of dust in supernovae and their circumstellar media. Analysis of dust formation, heating, cooling, and grain destruction processes in supernova ejecta and the shocked interstellar medium. The evolution of supernovae light curves. Echoes from line and continuum emission from supernovae.

Solar System
The nature and origin of the infrared emission from the interplanetary dust cloud