Materials science in science fiction is when writers use their imaginations to create materials that do not exist in the real world. In science fiction, these materials are fictional and often provide special properties that can help the characters achieve their goals. For example, a writer might create a type of metal that is indestructible or an energy source that is more powerful than anything we have today. By creating these materials, writers can show how their characters can use the power of science and technology to overcome obstacles and reach their goals.