What happens when an immovable object meets an unstoppable force?

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?

Can a molecule have bond dipoles but not have a molecular dipole?