The main reason behind the seasons on earth is it’s tilt on its axis. Axis is an imaginary line passing through the poles. 23.5 degree angle is formed to the perpendicular of the orbit of earth and axis always points in the same direction throughout the year.
Rays coming from sun hits at smaller angle as [...]

It is believed that earth is formed four and a half billion years ago from a huge mass of gas. A force pulls everything with the same power from the centre which is called gravitational force and this force is almost equal at every place on the earth. If this force was not equal everywhere [...]

Stars appear as twinkling when we look at them from the earth’s surface. Light travels from the stars towards the earth while reaching the earth surface it has to pass from many layers of the atmosphere of different densities and temperature, as we know that temperature decreases by 6.5 degree Celsius, every kilometer we go [...]