| Hint | Answer |
|---|
| Decommissioned robotic space probe that was designed to study the Sun | |
| Science satellite used from 1991 to 2005 to study Earth's atmosphere | |
| Series of lower-cost, highly focused scientific space missions that are exploring the Solar System | |
| Joint NASA/BMDO project to test sensors and spacecraft components under extended exposure to space environment | |
| Developed by NASA's Jet Propulsion Laboratory to return to Mars after a 10-year absence | |
| Joint NASA/ESA/ASI spacecraft mission studying the planet Saturn and its many natural satellites | |
| Designed for long-term global observations of the land surface, biosphere, atmosphere, and oceans of the Earth | |
| NASA project with focus on engineering validation of new technologies for space applications | |
| Joint NASA/German Aerospace Centre mission to make detailed measurements of Earth's gravity field | |
| Ongoing robotic space mission involving two rovers exploring the planet Mars | |
| rRobotic spacecraft that orbited the planet Mercury | |
| Series of space exploration missions being conducted by NASA with the purpose of researching several of the Sun's planets including Jupiter, Venus, and the dwarf planet Pluto | |
| NASA initiative to send a series of small, low-cost robotic missions to Mars | |
| NASA spacecraft tasked with the exploration and study of the asteroid Vesta and the dwarf planet Ceres | |
| NASA robotic spacecraft currently orbiting the Moon on a low 50 km polar mapping orbit | |
| NASA mission to land and operate a rover named 'Curiosity' on the surface of Mars | |
