Unmanned space probes are being launched to the moon, a comet, an asteroid, the planets Mars, and Mercury and probes will orbit and land on Saturn — all within the next 18-months as an solar system exploration extravaganza unfolds. The National Aeronautics and Space Administration (NASA), the European Space Agency (ESA), and the Japanese space agency have a fleet of space probes either set to be launched or now in route to explore the frontier of solar system space. The fleet may prove to be the most exciting time in space exploration since the “Grand Tour of the Planets” by the Voyager space probes flew past Jupiter, Saturn, Uranus, and Neptune in the late 20th Century.