Interstellar travel, also known as interstellar navigation, is the term used to describe travel between stars. It is a rapidly growing area of research as humanity continues to explore the depths of space. Another synonym for interplanetary travel is intergalactic travel, which refers to travel between galaxies. Space travel is a more general term that can refer to any type of travel beyond Earth's atmosphere, including suborbital flights and low Earth orbit missions. Cosmic travel, celestial travel, and galactic travel are also synonyms for interplanetary travel. As technology advances, the possibility of interplanetary travel becomes increasingly feasible, and humans could one day become an interplanetary species.