A prototype solar device that produces enough hot air from the sun's rays to drive the turbines of a 50 kw power station has brought the prospect of cheap, solar-generated electricity a step closer.

The rightplace to look for extraterrestrial life is not planets of other solar systems but their moons

human assault on the earth's atmosphere continues. Recently, the World Meteorological Organization ( wmo ), a un agency based in Geneva, revealed that the ozone hole measured over the

Annual emissions of anthropogenic Hg to the atmosphere in different regions of the world during the last decade show an interesting dichotomy: the emissions in the developed countries increased at the rate of about 4.5–5.5% yr−1 up to 1989 and have since remained nearly constant, while in developing countries the emissions continue to rise steadily at the rate of 2.7–4.5% yr−1. On a global basis, however, the total anthropogenic emissions of Hg increased by about 4% yr−1 during the 1980s, peaked in 1989 at about 2290 t and are currently decreasing at the rate of about 1.3% yr−1.

ALL the diatribe and deliberations about protecting the ozone layer have not been just a lot of talk. Recently scientists reported that the concentration of ozone-depleting chemicals in the

AN ESTIMATED 35 million tonnes of methane goes up into the atmosphere each year, thanks to leaks in Russian gas pipelines and wellheads, says an unpublished report from Russian researchers. This

The Infrared Space Observatory (ISO) has detected Water inthe planetary nebula NGC7027. The ISO is ideally suited for observations, since it is outside the earth's atmosphere, which acts a major

WHILE the debate on global warming -continues, the detection of an astounding 45 per cent depletion of the mone layer, over an area stretching froth Greenland to western Siberia,

Oxygen is the component that sustains life on earth. Too much or too little of it could change the entire life scenario on the planet. How does nature then keep the oxygen content in check?

Opinions on Jupiter's evolution have undergone a revision, following the data sent by the Galileo probe. Previous measurements had suggested that Jupiter contained about 10 times more oxygen

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