Sagan: And His Odyssey Galore.

Sagan is a satellite that explores the galaxy and space and provides information back to Earth about other planets from weather, atmosphere's, as well as images. Sagan is also named after a great astronomer, planetary scientist, cosmologist, astrophysicist, astrobiologist, author, and science communicator. So Sagan is really not alone as long as the planets keep him company.