Astronomy

Astronomy

In ancient times, when science wasn’t much cared of, people used to believe that the earth, or the ground they’re standing on, is flat and that under the ground, there are five cows and over their spikes, the ground is standing and we are all standing over the ground. When a cow bends down a little to take some water, then the earth quakes!

They also believed that over the sky is a huge monstrous container and at the sides in the inner of the container, is some mud attached. This container is filled with water (as it was thought on those days). When the mud is moved a little, the water escapes from the container and falls as rain!

These are two of the crazy belief of the ancient age. Later astronomical scientists proved that these beliefs are actually crazy. From then on science started keeping on innovating. Those people of that age never tried to understand or even if they tried to, if we’re standing on the ground and the ground is standing over the cows’ spikes, then over what are the cows standing on?!!! Or if where does the water come from that in the container over them?!!!

Now keep on going with the definitions…

Solar system: 8 planets are orbiting the sun in an elliptical path. The sun and the planets are altogether known as solar system.

Gravitational field strength: Gravitational force on 1kg mass is known as gravitational field strength.

Luminous object: These objects which emit light are known as luminous object. E.g. Sun, Stars.

Non-luminous object: Objects that can’t emit its own light is known as luminous object. E.g. Planets, Moons.

Gravitational pull: Gravitational pull on nearest planet is highest. If gravitational pull is large, the motion is faster and the path is more curved. Like the path that Mercury has more curved path towards the Sun than Neptune.