Sun Probe was a space probe used to collect particles from around the sun. If not for International Rescue, the Sun Probe mission would have been a disaster. Using an ion drive and a chemical rocket system, the Sun Probe's launch thrust of 20 million pounds gave it the acceleration to reach solar orbit in a week. Even Cape Kennedy's backup system couldn't stop the Sun Probe from heading straight for the sun. A safety beam activated from Thunderbird 3 managed to fire the retros, which allowed the Sun Probe to head back to Earth.