| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| best space opera science fiction books | 0.47 | 0.8 | 4947 | 99 |
| space opera science fiction | 0.3 | 1 | 6486 | 26 |
| the best space opera books | 1.96 | 0.5 | 254 | 15 |
| best space opera series books | 0.32 | 0.6 | 785 | 72 |
| best sci-fi book series with space opera | 1.11 | 0.8 | 5174 | 8 |
| best space opera novels | 1.2 | 0.8 | 909 | 50 |
| sci fi space opera books | 0.71 | 0.7 | 9009 | 60 |
| best space opera books of all time | 0.47 | 0.9 | 4629 | 26 |
| top space opera books | 0.84 | 0.4 | 9835 | 93 |
| best space opera novels of all time | 2 | 0.2 | 8459 | 90 |
| greatest space opera novels | 1.45 | 0.6 | 9291 | 58 |
| top 10 space opera books | 1.17 | 0.1 | 1833 | 96 |
| great space opera novels | 0.81 | 0.7 | 8230 | 90 |
| latest space opera novels | 1.54 | 0.7 | 8232 | 47 |
