The legendary NASA Pioneer 10 has passed its 25th year in space and is now 9.76 billion kilometres from Earth. The satellite will be retired on 31 March.

The TRW-built Pioneer made the first fly-by of Jupiter in 1973, and was also the first man-made object to leave the Solar System, in 1983. Two of its 11 instruments are still returning data to the Earth via an 8W transmitter.

The signals take 9h 10min to reach the Earth.

Source: Flight International