 Google |
 |
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | spaceref.com | 5 | 146000 | 97500 |
| 3 | youtube.com | 9 | 79700000 | 382000000 |
| 5 | berkeley.edu | 9 | 3190000 | 3130000 |
| 7 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 8 | spacemart.com | 3 | 221000 | 8190 |
| 10 | spaceref.ca | 4 | 72400 | 12400 |
| 11 | aurora.phys.ucalgary.ca | |||
| 12 | digg.com | 8 | 261000000 | 9190000 |
| 13 | satellitetoday.com | 5 | 24200 | 18900 |
| 14 | californiaspaceauthority.org | - | ||
 Yahoo |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 2 | berkeley.edu | 9 | 3190000 | 3130000 |
| 4 | youtube.com | 9 | 79700000 | 382000000 |
| 5 | ds9.ssl.berkeley.edu | - | 1380 | 1100 |
| 6 | spaceref.com | 5 | 146000 | 97500 |
| 7 | smsc.cnes.fr | - | ||
| 10 | scribd.com | 7 | 1110000 | 9600000 |
| 11 | spacemart.com | 3 | 221000 | 8190 |
| 12 | m.youtube.com | 8 | 32300000 | 607000 |
| 14 | igpp.ucla.edu | |||
 Msn |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | berkeley.edu | 9 | 3190000 | 3130000 |
| 3 | youtube.com | 9 | 79700000 | 382000000 |
| 4 | aurora.phys.ucalgary.ca | |||
| 5 | smsc.cnes.fr | - | ||
| 6 | spaceref.com | 5 | 146000 | 97500 |
| 8 | ds9.ssl.berkeley.edu | - | 1380 | 1100 |
| 9 | spacemart.com | 3 | 221000 | 8190 |
| 10 | whatonmars.com | |||
| 12 | directory.eoportal.org | |||
| 13 | satellitetoday.com | 5 | 24200 | 18900 |
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