 Google |
 |
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | nasa.gov | 9 | 4910000 | 35900000 |
| 3 | dmoz.org | 8 | 6510000 | 1820000 |
| 4 | wyomingspacegrant.uwyo.edu | |||
| 5 | kids.gov | 9 | 35200 | 98 |
| 7 | google.com | 1- | 423000000 | 36800000 |
| 8 | kidsolr.com | - | ||
| 10 | sciencedaily.com | 8 | 946000 | 131000 |
| 11 | wired.com | 9 | 7380000 | 1640000 |
| 12 | enotes.com | 5 | 61900 | 309000 |
| 13 | dlese.org | 7 | 12800 | 52500 |
 Yahoo |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | nasa.gov | 9 | 4910000 | 35900000 |
| 2 | desicritics.org | 5 | 260000 | 13000 |
| 3 | helios.gsfc.nasa.gov | 7 | 4320 | 163 |
| 4 | kids.gov | 9 | 35200 | 98 |
| 5 | 101science.com | 4 | 4260 | 247 |
| 6 | quest.nasa.gov | 7 | 6770 | 14600 |
| 7 | nasascience.nasa.gov | 8 | 5390 | 2700 |
| 9 | kidsolr.com | - | ||
| 11 | researchernews.larc.nasa.gov | 7 | 179 | 116 |
| 12 | islandwebdiva.com | |||
 Msn |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | quest.arc.nasa.gov | 7 | 37800 | 4580 |
| 2 | blogs.discovermagazine.com | 6 | 243000 | 14300 |
| 4 | math-science-news.blogspot.com | |||
| 5 | coe.west.asu.edu | - | ||
| 6 | quest.nasa.gov | 7 | 6770 | 14600 |
| 7 | valdosta.edu | 6 | 31600 | 36600 |
| 8 | istp.gsfc.nasa.gov | - | ||
| 9 | edunetconnect.com | |||
| 10 | funsci.com | |||
| 11 | globe.gov | - | ||
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