sentence: Artificial satellites are smaller, unmanned spacecraft.
sentences_before: Some of the most important spacecraft today are artificial satellites.
sentences_after: Some go into Low Earth orbit to look at the Earth or for other purposes. Others are sent to geostationary orbit to relay radio signals from one part of Earth to another, or to watch events on Earth from a high point of view. Communications satellites are important for television and other communications, and other satellites help with weather prediction and other jobs.
concept_name: artificial satellite
headings: Spacecraft Satellites