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comets are occasionally scattered into the inner Solar System by the gravitational fields of nearby stars and giant molecular clouds. There are about 50 known periodic comets in the ‘Jupiter’ family whose aphelion distance is near Jupiter’s...
asthma and the number of hospital admissions in pediatric institutions (Beyth, 1997). Currently, asthma in children considered as a chronic disease, which based on allergic airway inflammation and bronchial hyper-reactivity. It is character...
environmental concerns. Wind, Sand, Dust In Afghanistan the two major environmental concerns are dust storms and sandstorms that increase during the summer. The effect of wind and masses of sand and dust are the most common skin disorders, ...
moon mission in order to beat Russia to the moon. They went to the moon and collected rock samples and brought them back to earth. So NASA thought the mission was a complete success. But, there are many speculations about the moon landing. ...
stars. As more and more material fell into the new star, pressure at its center, eventually became large enough to begin process of nuclear fusion, in which nuclei of hydrogen and helium fuse to form heavier elements. This was accompanied b...
upon how meteorites fall, and what is the mere reason that they strike our planet. In the past, it was considered as a mythical phenomenon, where almost no one has observed the strike of meteorite. However, in this contemporary era, scienti...
particulate matter (PM) or fine particles, are tiny subdivisions of solid or liquid matter suspended in a gas or liquid. In contrast, aerosol refers to particles and the gas together. Sources of particulate matter can be man made or natural...