| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| planetary nebula images | 0.76 | 0.1 | 3584 | 18 | 23 |
| planetary | 0.98 | 0.1 | 742 | 17 | 9 |
| nebula | 1.64 | 0.2 | 901 | 79 | 6 |
| images | 0.6 | 0.4 | 5238 | 97 | 6 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| planetary nebula images | 1.47 | 0.1 | 5924 | 22 |
| planetary nebula definition and images | 0.48 | 0.3 | 3810 | 12 |
| planetary nebula example images | 1.96 | 0.7 | 1640 | 88 |
| image of planetary nebula | 0.35 | 0.6 | 7835 | 26 |
| planetary nebula definition and formation | 1.97 | 0.6 | 5760 | 34 |
| planetary nebula definition and evolution | 0.18 | 0.4 | 737 | 3 |
| planetary nebula example names | 1.05 | 0.5 | 868 | 31 |
| planetary nebula and nebula | 1.78 | 0.5 | 4790 | 22 |
