by Rajan Gupta | Aug 27, 2020 | Universe
Artificial satellites are placed in their orbits around the earth with the help of very powerful launch vehicles or rockets. For this purpose specially designed rockets are fabricated by scientists. In rockets special kinds of fuels called rocket propellants are...
by Rajan Gupta | Aug 27, 2020 | Universe
A satellite is a small body which revolves around a planet. For example, moon is the satellite of the earth because it revolves around it. Satellites always revolve around the planets in closed elliptical paths. The closed elliptical path of a satellite around a...
by Rajan Gupta | Aug 27, 2020 | Universe
Various theories have been put forward by scientists to explain origin of universe. But here we will discuss only two theories related with origin of universe. These are: Big-bang theory and Steady state theory Big-Bang Theory In 1920, an American...
by Rajan Gupta | Aug 27, 2020 | Universe
We have already studied in evolution of earth that the earth is made up of three layers. These are: Crust Mantle and Core Crust Crust is the outermost solid and rocky layer of earth. The chief component of crust is silicon, which is present in the form of...
by Rajan Gupta | Aug 27, 2020 | Universe
The earth was formed about 450 crore years ago from very vast clouds of gases and dust particles present in the form of disc around the sun. These particles of gases and dust collided and merged with each other to form small chunks of matter...
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