Cosmonaut Yuri Gagarin is first person in space
Astronaut Neil Armstrong is first human on moon
NASA's Voyager program explores outer space
Magellan spacecraft maps Venus
Galileo is first spacecraft to orbit Jupiter
Ulysses mission studies the heliosphere
Cassini-Huygens probe explores Saturn and Titan
International Space Station (ISS) is home to six people
Mars exploration rovers are twin robot geologists
Rosetta space probe chases icy comet
New Horizons in first spacecraft to explore Pluto
Messenger is first spacecraft to orbit Mercury
Where in the solar system?
