We know the earth is not the center of everything. We know the forces of gravity and the size of stars and galaxies are beyond our ability to grasp, and they dwarf us and our lives in comparison. But that knowledge doesn't mean you have to live by a desolate story. It lends itself to nobility and heroism just as easily as any other body of knowledge. For example, you also know that this one little planet is the only one we know of with life on it.
Life is precious.
The existence of the universe, and the existence of life is nothing short of awe-inspiring. They consider it their sacred duty to protect and preserve this planet and its precious forms of life. A person in a position of power may work for policies to prevent animals from becoming extinct or policies to clean up pollution or policies to promote cooperation with other nations. A mother may devote her life to her children and give them wisdom and courage and an appreciation for this rare planet. A typist for a large office may devote some of his spare time to writing letters to his representatives on issues he thinks are important, fighting the noble battle for Life.