The technology used to send signals into space is known as "radio transmission." This involves the use of radio waves to transmit data over vast distances, enabling communication with satellites, space probes, and other spacecraft. Ground stations utilize powerful antennas to send and receive signals, which antennas convert into electromagnetic waves. These signals carry various types of information, including telemetry, scientific data, and communications. Radio transmission is crucial for space exploration, allowing scientists to receive data from missions like the Mars Rover or the Voyager spacecraft. It plays an essential role in our understanding of the universe.