In the movie " Interstellar," Murphy finally understood the true meaning of the universe. He realized that humans were insignificant in the universe and that Earth was just an ordinary planet. Through this realization, Murphy put down his obsession with Earth and reconsidered his future. He also realized that mankind needed to pay more attention to the exploration and utilization of the universe to contribute to the development of future civilization. This realization also brought a deeper meaning to the ending of the movie.