Moreover, interstellar exploration and colonization offer a means to secure new resources and energy sources. As the global population continues to grow, the demand for resources such as water, minerals, and energy will increase. By expanding into the cosmos, we can access new sources of these resources, alleviating the pressure on Earth's ecosystems and enabling sustainable growth. For instance, the discovery of exoplanets with conditions similar to those of Earth could provide new sources of water, food, and minerals, supporting human civilization's continued growth.
The line “No, it’s necessary” responds to TARS (the robot) asking: “What if she never came back for the watch?” Cooper realizes that his abandonment of Murph as a child was the very trauma that drove her to become a scientist. His departure was necessary for her success. no it's necessary interstellar