A space probe is an unmanned spacecraft that leaves Earth orbit and explores space. It may approach the Moon; enter interplanetary space; fly by, orbit or land .\rbr\rbrUnmanned probes are hurling through the cosmos in record numbers. Traveling billion of miles from Earth, they are carrying out longer more complex missions .\rbr\rbr\rbr\rbrSpace Documentary - National Geographic: Deep Space Probes Unmanned probes are hurling through the cosmos in record numbers. Traveling billion of miles .\rbr\rbrSpace Documentary National Geographic Deep Space Probes This documentary and the rest of the documentaries presented relate to important times and .