Starship Asterisk*

Thanks Chris. I don't want to impose upon you further, BUT I want to understand why the Earth is where it is, and the day and year are as long as they are. Can you tell me where to look to read about the elements of celestial mechanics that determine the orbit and speed of circulation and spin of a ...

bystander, Chris, thanks you both for those answers. Now, if 2r/R is the calculation for the tidal force, then the force on the moon is about a quarter of the force on Earth, isn't it? Because the r of the moon is about a quarter of the r of Earth. If I understand your comment about tidal locking co...

I have recently read that the gravitational force between Earth and Moon is something like 2 x 10^20, and we get tides.

What is the force on Io which creates all the activity?