| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| history of space exploration book | 0.37 | 0.7 | 8742 | 100 | 33 |
| history | 0.7 | 0.8 | 9591 | 47 | 7 |
| of | 0.2 | 0.1 | 4396 | 97 | 2 |
| space | 0.2 | 0.8 | 7314 | 86 | 5 |
| exploration | 0.68 | 0.4 | 6707 | 62 | 11 |
| book | 1.14 | 0.7 | 7981 | 21 | 4 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| history of space exploration book | 1.5 | 0.3 | 1450 | 68 |
