 Google |
 |
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | wiki.answers.com | 7 | 1960000 | 11800000 |
| 3 | math.ucr.edu | - | 55100 | 5100 |
| 4 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 6 | organicconsumers.org | 7 | 148000 | 28500 |
| 7 | answers.yahoo.com | 8 | 26200000 | 127000000 |
| 9 | ourworld.compuserve.com | 5 | 424000 | 61600 |
| 10 | physicsforums.com | 4 | 24100 | 1480000 |
| 12 | braeunig.us | 3 | 4130 | 134 |
| 13 | science.nasa.gov | 7 | 180000 | 3750 |
| 14 | discovermagazine.com | 7 | 370000 | 27100 |
 Yahoo |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 2 | exploration.grc.nasa.gov | 6 | 2100 | 671 |
| 3 | nov55.com | 3 | 1700 | 542 |
| 4 | aerospaceweb.org | 6 | 16500 | 1380 |
| 5 | ourworld.compuserve.com | 5 | 424000 | 61600 |
| 6 | wisegeek.com | 6 | 48200 | 37900 |
| 7 | howstuffworks.com | 5 | 3060000 | 2140000 |
| 9 | web.mit.edu | 9 | 1360000 | 605000 |
| 10 | science.nasa.gov | 7 | 180000 | 3750 |
| 11 | answers.yahoo.com | 8 | 26200000 | 127000000 |
 Msn |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 2 | newton.dep.anl.gov | 8 | 15300 | 17200 |
| 4 | radioshack.com | 7 | 227000 | 48100 |
| 5 | exploration.grc.nasa.gov | 6 | 2100 | 671 |
| 6 | qrg.northwestern.edu | 5 | 945 | 1990 |
| 7 | science.nasa.gov | 7 | 180000 | 3750 |
| 8 | metacafe.com | 7 | 1010000 | 16000000 |
| 9 | rocketfuelinc.com | 4 | 49 | 2 |
| 10 | instructables.com | 7 | 330000 | 1830000 |
| 11 | organicconsumers.org | 7 | 148000 | 28500 |
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