However , he realized that his equations permitted the introduction of a constant term which could counteract the attractive force of gravity on the cosmic scale .
This is because masses distributed throughout the universe gravitationally attract , and move toward each other over time .
He realized that his equations permitted the introduction of a constant term which could counteract the attractive force of gravity on the cosmic scale .
This is because masses distributed throughout the universe gravitationally attract , and move toward each other over time .