The Hubble has a variety of scientific instruments on-board. Among the instrumentation are two cameras, two spectrographs , and guidance sensors. Hubble is controlled by scientists here on Earth who use gyroscopes to measure the rate at which Hubble is moving. When Hubble is being re-aimed from one object to another, it moves very, very slowly. Other gyroscopes help keep the telescope pointed steadily at its target.
Scientists communicate with Hubble by radio signals.
Hubble , in turn, sends images and data it has gathered to Earth by radio signals. This satellite relays the data to a terminal in White Sands, New Mexico. This terminal then sends the information up to another satellite which then sends it down to NASA at Goddard Space Flight Center in Greenbelt, Maryland. Any communication to Hubble has to travel back along the same path. Hubble has two solar panels which are each 2.3 meters by 11.9 meters in size.