| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| best space opera books of all time | 0.17 | 0.6 | 5427 | 23 |
| best space opera book series of all time | 1.86 | 1 | 3134 | 41 |
| best selling space opera books | 1.49 | 1 | 7901 | 66 |
| best new space opera books | 1.2 | 0.3 | 2804 | 7 |
| good space opera books | 0.5 | 0.9 | 6375 | 72 |
| best space opera audio books | 1.14 | 1 | 785 | 26 |
| recent space opera books | 0.96 | 0.8 | 1272 | 3 |
| the very best published space opera | 1.72 | 0.9 | 7221 | 91 |
| best space opera series | 0.4 | 0.1 | 5952 | 99 |
| best space opera series audio books | 1.93 | 0.6 | 9205 | 61 |
| great space opera books | 0.08 | 1 | 552 | 18 |
| good modern space opera books | 1.53 | 0.1 | 1092 | 27 |
| top space opera book series | 1.06 | 0.2 | 9315 | 60 |
| space opera series books | 1.11 | 0.3 | 5727 | 16 |
| greatest space opera science fiction novels | 0.32 | 0.7 | 2181 | 78 |
