| voyager spacecraft | 7 |
| robotic spacecraft | 6 |
| dragon spacecraft | 3 |
| apollo spacecraft | 2 |
| orion spacecraft | 2 |
| reusable spacecraft | 2 |
| gemini spacecraft | 1 |
| mission | 168 |
| trajectory | 8 |
| orbit | 0.56 |
| elliptical orbit | 0.46 |
| lunar orbit | 0.45 |
| excellent health | 0.41 |
| sunlight | 0.40 |
| polar orbit | 0.39 |
| piece | 0.38 |
| solar orbit | 0.35 |
| right orbit | 0.35 |
| interstellar space | 0.35 |
| More » |
| enter the atmosphere | 0.75 |
| return to earth | 0.74 |
| orbit mars | 0.71 |
| go into safe mode | 0.70 |
| orbit the earth | 0.68 |
| burn up in the atmosphe… | 0.67 |
| make contact | 0.65 |
| enter orbit | 0.62 |
| communicate with earth | 0.58 |
| orbit the moon | 0.58 |
| More » |
| enough fuel | 0.48 |
| instrument | 0.42 |
| enough power | 0.42 |
| the capability | 0.35 |
| malfunction | 0.31 |
| attitude control propel… | 0.28 |
| new approach and dockin… | 0.28 |
| new computer | 0.28 |
| more power-efficient so… | 0.28 |
| four landing legs | 0.25 |
| More » |
| aluminum honeycomb | 0.28 |
| designed | 0.76 |
| launched | 0.72 |
| scheduled for launch | 0.69 |
| placed in orbit | 0.63 |
| built | 0.62 |
| bound for mars | 0.59 |
| sent to mars | 0.59 |
| launched in november | 0.57 |
| separated | 0.57 |
| close to earth | 0.53 |
| More » |
| communication | 0.47 |
| earth observation | 0.43 |
| navigation | 0.38 |
| meteorology | 0.37 |
| transportation of human… | 0.36 |
| space colonization | 0.32 |
| planetary exploration | 0.32 |