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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 2 | windows.ucar.edu | 7 | 55700 | 42500 |
| 4 | coldwater.k12.mi.us | 3 | 1510 | 429 |
| 5 | stardate.org | 8 | 59300 | 3950 |
| 6 | chandra.harvard.edu | 7 | 80700 | 12400 |
| 7 | seds.org | 7 | 253000 | 63900 |
| 8 | allthesky.com | 5 | 10700 | 3660 |
| 9 | space.about.com | 6 | 33300 | 17000 |
| 10 | wiki.answers.com | 7 | 1960000 | 11800000 |
| 12 | astronomy.net | - | ||
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 2 | perseusdigital.com | 1 | 125 | 15 |
| 3 | stardate.org | 8 | 59300 | 3950 |
| 4 | allthesky.com | 5 | 10700 | 3660 |
| 6 | windows.ucar.edu | 7 | 55700 | 42500 |
| 9 | chandra.harvard.edu | 7 | 80700 | 12400 |
| 10 | scientific-web.com | 5 | 27500 | 756 |
| 11 | bisque.com | |||
| 12 | ehow.com | 7 | 2790000 | 2100000 |
| 13 | universetoday.com | 5 | 181000 | 12100 |
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 2 | astro.wisc.edu | 6 | 27700 | 6020 |
| 3 | windows.ucar.edu | 7 | 55700 | 42500 |
| 4 | coldwater.k12.mi.us | 3 | 1510 | 429 |
| 5 | chandra.harvard.edu | 7 | 80700 | 12400 |
| 6 | allthesky.com | 5 | 10700 | 3660 |
| 7 | perseusdigital.com | 1 | 125 | 15 |
| 8 | space.about.com | 6 | 33300 | 17000 |
| 9 | stargazing.suite101.com | 4 | 3660 | 237 |
| 10 | comfychair.org | |||
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