The phrase "unmanned spacecraft" refers to a type of spaceship or vehicle that does not have any human beings on board. It is controlled and operated by computers or remote control instead. Full definition
The Center of the Universe — officially dubbed the Space Flight Operations Facility — controls NASA's Deep Space Network, a system of 15 antennas strategically placed in three different locations around the world that control unmanned spacecraft. (discovermagazine.com)
Dozens of unmanned spacecraft, including orbiters, landers, and rovers, have been launched toward Mars since the 1960s. (sciencedaily.com)
The Hubble Space Telescope is an iconic observatory, a triumph of space science that may be the most famous unmanned spacecraft since Sputnik. (scientificamerican.com)