Neptune, the last planet in our solar system, has barely been studied. But the planet and its giant moon Triton hold many secrets-Triton could even harbor life! Learn how engineer Mahmooda Sultana plans to send a probe to Neptune in a fraction of the time-and at a fraction of the cost-of traditional probes by sailing on sunshine. The books in the Out of This World series feature projects that have won grants from the NASA Innovative Advanced Concepts program (NIAC). The program provides funding to teams working to develop bold new advances in space technology.