| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| what have we sent to mars | 0.2 | 0.3 | 5998 | 62 |
| how many rovers have we sent to mars | 0.5 | 0.5 | 2625 | 100 |
| have we sent anyone to mars | 1.66 | 0.2 | 3075 | 29 |
| have we sent a man to mars yet | 1.75 | 0.6 | 9526 | 85 |
| how many robots have we sent to mars | 0.96 | 0.9 | 5249 | 94 |
| why haven't we sent people to mars | 1.66 | 0.5 | 7762 | 38 |
| have we sent space probes out of the galaxy | 1.33 | 0.1 | 3266 | 80 |
| have they sent people to mars | 1.48 | 0.8 | 9175 | 6 |
| first thing sent to mars | 0.01 | 0.2 | 6481 | 97 |
| plans to send people to mars | 0.13 | 0.8 | 1312 | 10 |
| sending people to mars | 0.44 | 0.7 | 2044 | 89 |
| send people to mars | 0.7 | 0.7 | 2710 | 29 |
| nasa sending people to mars | 1.56 | 0.8 | 6272 | 80 |
| space technology sent to mars | 0.66 | 0.3 | 1821 | 92 |
| sending humans to mars | 1.87 | 0.6 | 2199 | 69 |
| those having trip to mars | 1.99 | 0.4 | 1598 | 96 |
| has anyone traveled to mars | 0.28 | 0.9 | 7255 | 36 |
| nasa sending humans to mars | 1.68 | 0.5 | 9380 | 38 |
| deliver us to mars | 1.88 | 0.7 | 8585 | 31 |
| every spacecraft on mars | 0.36 | 0.7 | 6755 | 24 |
