I was looking at Wikipedia's Solar system page, and it says that Sun represents 99.86% of the whole solar system mass. I found that pretty huge.
- Why is it such a high ratio in this 3 examples?
- Is 1% a regular number for satellites' mass?
- It is simple gravitation maths ?
I understand that one body has to be much more massive in order to be a planet-satellite system, otherwise it's a double planet system. But I would have thought 90% would be enough.