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 Google |
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | science.ksc.nasa.gov | 6 | 36500 | 25300 |
| 2 | coolcosmos.ipac.caltech.edu | 7 | 14600 | 2200 |
| 3 | qrg.northwestern.edu | 5 | 945 | 1990 |
| 4 | astronomycafe.net | 6 | 4630 | 2060 |
| 5 | wiki.answers.com | 7 | 1960000 | 11800000 |
| 7 | answerbag.com | 6 | 2780000 | 4710000 |
| 9 | answers.yahoo.com | 8 | 26200000 | 127000000 |
| 11 | astro.uu.nl | 7 | 6530 | 13300 |
| 12 | arcamax.com | 6 | 50500 | 153000 |
| 13 | math.ucr.edu | - | 55100 | 5100 |
 Yahoo |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | science.ksc.nasa.gov | 6 | 36500 | 25300 |
| 2 | coolcosmos.ipac.caltech.edu | 7 | 14600 | 2200 |
| 3 | space-travel.com | 4 | 178000 | 5590 |
| 4 | blurtit.com | 5 | 25800 | 264000 |
| 6 | answerbag.com | 6 | 2780000 | 4710000 |
| 7 | essortment.com | 6 | 49100 | 47800 |
| 9 | astronomycafe.net | 6 | 4630 | 2060 |
| 10 | sciencedaily.com | 8 | 946000 | 131000 |
| 12 | wiki.answers.com | 7 | 1960000 | 11800000 |
| 13 | answers.google.com | 6 | 117000 | 254000 |
 Bing |
|
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | coolcosmos.ipac.caltech.edu | 7 | 14600 | 2200 |
| 2 | pbskids.org | 8 | 295000 | 257000 |
| 3 | science.ksc.nasa.gov | 6 | 36500 | 25300 |
| 4 | qrg.northwestern.edu | 5 | 945 | 1990 |
| 5 | educ.queensu.ca | 6 | 8310 | 6970 |
| 6 | nasa.gov | 9 | 4910000 | 35900000 |
| 7 | astro.uu.nl | 7 | 6530 | 13300 |
| 9 | space-travel.com | 4 | 178000 | 5590 |
| 11 | quest.arc.nasa.gov | 7 | 37800 | 4580 |
| 12 | pearsoned.com | 7 | 197000 | |
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