I only know time dilation in it's basic form and it was explained to me beautifully using mirrors in a spacecraft . The light would go vertically, taking longer if you were at a stationary frame looking into the spacecraft . This all made sense to me; however, what would happen if the mirrors...
I understand orbit and why the moon doesn't collide with the earth, but why doesn't the Earth collide with the moon? Shouldn't the mutual gravitational forces attract each other, get stronger, until they eventually meet?