This paper explores the efficiencies expected for threeand four-junction devices for both space and terrestrial applications. For space applications, the effects of temperature and low concentration are investigated. For terrestrial applications, a concentration of 500 suns is assumed and the theoretical efficiencies are calculated as a function of spectral variations including the effects of a...

I discuss three issues relevant to solar neutrino flux measurements: cross section uncertainties in pp chain reactions, uncertainties in the GALLEX/SAGE response to 7 Be and 51 Cr neutrinos, and the implications of helioseismology for nonstandard suns with mixed cores. A few comments are also offered on νe ↔ ντ oscillations, cosmologically interesting neutrino masses, and recent proposals for s...

a numerical relationship (Bode's Law). The visible stars, largely aggregated in a circumferential view as the " milky way," are a teeming multitude in various stages of evolution, self-luminous. They are suns, perhaps with non-luminous worlds rotating round them. The spectra of the stars comprise three groups : (i) Those in which hydrogen, helium, and magnesium are prominent, hydrogen predomina...

After up to 30 million years of splendid isolation due its extreme climate, circumpolar currents and sea ice, Antarctica is now exposed man-made threats, including the import invasive species meltdown ice shield. Michael Gross reports.

Rabies virus exists in dogs on Sri Lanka as a single, minimally divergent lineage only distantly related to other rabies virus lineages in Asia. Stable, geographically isolated virus populations are susceptible to local extinction. A fully implemented rabies-control campaign could make Sri Lanka the first Asian country in >30 years to become free of rabies virus.