 Google |
 |
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 3 | techbriefs.com | 6 | 7870 | 13500 |
| 4 | pubs.asce.org | 7 | 28100 | 216000 |
| 5 | nar.org | 6 | 15500 | 954 |
| 7 | patentstorm.us | 5 | 18800 | 9000000 |
| 8 | space-exploration.suite101.com | - | 3080 | 65 |
| 9 | adsabs.harvard.edu | 8 | 329000 | 12800000 |
| 11 | rockets4schools.org | 5 | 280 | 133 |
| 12 | democraticunderground.com | 6 | 559000 | 3440000 |
| 13 | tripoli.org | 5 | 10100 | 487 |
 Yahoo |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | nar.org | 6 | 15500 | 954 |
| 2 | flyrockets.com | 5 | 1190 | 18 |
| 3 | braeunig.us | 3 | 4130 | 134 |
| 4 | memory-alpha.org | 5 | 154000 | 116000 |
| 5 | www2.tripoli-quebec.org | - | 130 | 166 |
| 6 | techbriefs.com | 6 | 7870 | 13500 |
| 7 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 10 | rocketcentral.org | 4 | 32 | 7 |
| 11 | pasco.com | 6 | 4820 | 12800 |
| 13 | space.com | 5 | 3140000 | 94800 |
 Msn |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 3 | tripoliwisconsin.org | |||
| 4 | braeunig.us | 3 | 4130 | 134 |
| 5 | aerorocket.com | 4 | 103 | 80 |
| 6 | nar.org | 6 | 15500 | 954 |
| 7 | lunar.org | 5 | 423 | 1370 |
| 8 | neofuel.com | 3 | 166 | 101 |
| 9 | techbriefs.com | 6 | 7870 | 13500 |
| 10 | rocketstore.co.uk | 4 | 285 | 3190 |
| 11 | flyrockets.com | 5 | 1190 | 18 |
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