zlacker

Simple illustration of what you are explaining in 1D. Imagine a simplified Earth:

Water -- Ground -- Water

Now let's add a Moon with gravitational pull. The pull stretches the system, because gravity is stronger the closer you are to the Moon.

Water ---- Ground ---- Water -//- Moon

The water is farther away from the ground on both sides now, since both sides stretched.

>>empiko+(OP)
so why is left water further away from ground? this example make 0 sense

>>heaven+DC
The Earth is being pulled away from that water, just as the water on the right is being pulled away from the Earth.