At three sites around the globe, NASA's Jet Propulsion Laboratory operates a network of large radio antennas called the Deep Space Network (DSN). The DSN is used to keep in contact with the spacecraft exploring our solar system and the universe beyond. This online tool will let you see what the DSN is up to right now. Which antennas are in use? Which spacecraft is talking to us? How quickly are data being received? How long does a signal take to get there and back?