Chapter 12
  The Truth There are too many things we don't know...


  Newton's law of universal gravitation states that every matter attracts each other. But how can mass cause attraction? Is it possible that there is other factor (instead of mass) that generates gravity?

Maybe there are other unknown factors that create gravitational force that make elements attract or repulse each other. Or are there other new forces that can be drawn from gravitational force? Or can we break down gravitational force into different forces? If we know where the gravitational force comes from, then we may control the gravity.

Please feel free to write us you have different ideas of what gravitational force is and where it comes from. It will help us understand more about physics and it may encorage other people to look for unknown facts.

If you don't mind, we can include your opinions in our tutorial.

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