Gravity is the force that is a push or pull upon an object. This is what keeps the planets in orbit around the sun because the sun's gravitational pull is holding the planets in its orbit. Another example that's more down to Earth is if you had a box blocking your way, what would you do? Well, you would hopefully push the box out of the way. Gravity is also the most influential force in the universe. Without gravity, you and all other forms of matter would float pointlessly around in space.
Now that we know what gravity is, let's talk about the two men that showed us what gravity is and it contribution to science. The first person to discover gravity is a man named Galileo. If his name is familiar to you than that's a good thing because he is the man who created the experiment where you drop two objects at equal level so that they would both fall to the ground at the same time. Surprisingly, the day that Galileo died, Sir Isaac Newton was born! Isaac Newton is the man that discovered that gravity's strength on an object depends on its mass and distance.
Ok, now that we know what gravity is and how it is important, let's now talk about mass, weight, distance, and see how they all play a role in how gravity affects you. Mass is how much space an object takes up. Distance is how far an object is from a starting point. Weight is how much force is to be acted upon the object, and this is why your weight changes on different planets.
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