It's probably not what you think. Most people think gravity is a pull caused by a big thing---like a planet. The earth is big and if something out there comes by too closely, the earth will pull it in, right?
Not really.
Gravity does not pull.
A massive object, that means big and dense and not just big, creates a dent in space/time. Imagine a trampoline. Now, put a bowling ball on ... >>full
Let's start with a simple idea. In physics, we know that all objects with mass have a gravitational pull on other objects with mass. We know that the bigger the mass, the greater the pull. And, the closer to an object you are, the greater that pull.
If you are in a space ship far from earth, earth will exert very little pull on your tiny craft. But as you get closer, earth's gravity will begin ... >>full
