Why does the earth rotate on its own axis? Why does it revolve around the sun? Why does it not collide with the sun? Answer .When the earth was formed, it rotated and revolved around the sun. According to Newton's...
The main attraction of comets is their shiny long tail. Most of a comet will be frozen ice. This frozen part, about a kilometer in size, is called the nucleus. The nucleus contains ice, dust, and frozen gases. As the...
Cesium 137 is produced in nuclear explosions and nuclear reactors. This is a big problem with low half-life isotopes. But it has many practical uses. It is used in radiation therapy. It is dangerous that most compounds of cesium are...
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