NASA (United States):
- Voyager 1 and 2 - Interstellar probes launched to study the outer planets and now exploring interstellar space.
- Pioneer 10 and 11 - Early spacecraft that conducted flybys of Jupiter and Saturn.
- New Horizons - Explored Pluto and the Kuiper Belt.
- Cassini-Huygens - Studied Saturn and its moons, including the Huygens probe landing on Titan.
- Curiosity Rover (Mars Science Laboratory) - Currently exploring the surface of Mars.
- Mars Rovers: Spirit, Opportunity, and Perseverance - Spirit and Opportunity explored Mars' surface, while Perseverance continues the mission.
- Viking 1 and 2 - Landed on Mars and conducted experiments to search for signs of life.
- Mariner Series - Various missions to explore Venus, Mars, and Mercury.