Gravity is one of the fundamentals of the universe and the force of attraction between every single existing body. It keeps the universe and our solar system, together.
Detailed Definition:
One of the first theories about the existence of gravity was made by Aristotle, a Greek philosopher. He believed that objects tend toward their inner heaviness. Many researches and scientists later, this theory became more developed and finally, in XVII century Isaac Newton (after being hit by the famous apple) described gravity as a force that keeps the planets in their place. This definition evolved into a law and formula (F=G*(M*m)/r^2) which we use today.
Every object has its gravitational field. The heavier the object, the greater is its force of attraction in this field. An apple has its gravitational field too, however it weighs thousands of times less than a planet. That is why we don't see it every day. The gravitational force of a planet is so big that we need a great speed and precise calculations to be able to fly away from it and not be brought back. It is measured by the acceleration it gives to the falling object. For example, at Earth's surface it is equal to 9,81 m/s and at the Moon's only 1,6 m/s.
Etymology:
from Old French, or from Latin gravitas ‘weight, seriousness’
Sample Sentence(s):
Every object with mass has gravity. Gravity creates stars and planets by pulling together the material from which they are made.
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