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Moment of truth
The Voyager I spacecraft is the most distant man-made object in the universe. It was launched in 1977 and as in 2002, it was more than 8 billions miles from the Earth.


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weathering Geol.
Breaking up of the rocks due to the action of weather elements. The breaking of rocks can be due to physical, biological or chemical effects. For instance, water trapped in rock pores expands and the rock cracks as the water freezes (physical effect).

western blotting Bio.
Technique for the analysis and identification of protein antigens. The proteins are separated by electrophoresis in polyacrylamide gel and then transferred to a nitrocellulose membrane or a treated paper, to which the proteins bind in a same pattern to that in the gel. Bands of antigens are detected by first overlying with antibody and then followed by anti-immunoglobulin or protein-A labeled with enzyme, fluorescent dye or radioisotope.

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