Entries on physical entites as well as biographies of astronomers, up-to-date information on space missions and recent discoveries, and information on telescopes and observatories...

More than 6,000 entries on "topics including climatology, economic geology, geochemistry, oceanography, palaeontology, petrology, and volcanology" as well as "planetary science, remote sensing, statistics, and sequence stratigraphy, wind strength scales, material, temporal, and chronostratigraphic units, geologic, lunar, and Martian time scales...

More than 1,300 entries covering "all areas of science, from physics and astronomy to medicine and ecology, including key figures in the fields of mathematics and technology...

Contains more than 2000 entries which explain "the jargon used in space exploration, including such weird and wonderful terms as 'cherry picker' and 'burp firing'; it also provides detailed articles on key subjects, such as the Apollo project, and a comprehensive chronology of space missions...

Full text access to important definitional reference works in the Physical Sciences and Mathematics, published by the Oxford University Press...

Has information on the history of physics and astronomy, cartoons, online reference sources, and a nice directory of university physics departments around the world...

Online encyclopedia covering many areas in the sciences: chemistry, computer science, earth science, environmental science, forensic science, mathematics, physics, space and astronomy, and weather and climate...