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 Google |
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | www-istp.gsfc.nasa.gov | 6 | 10700 | 1200 |
| 2 | gsfc.nasa.gov | 7 | 1290000 | 2330000 |
| 4 | nasa.gov | 9 | 4910000 | 35900000 |
| 6 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 8 | invent.org | 7 | 27700 | 1200 |
| 9 | brainyhistory.com | 5 | 56800 | 255000 |
| 10 | historylearningsite.co.uk | 5 | 19700 | 2220 |
| 11 | inventors.about.com | 7 | 82400 | 14000 |
| 12 | massmoments.org | 5 | 6520 | 8760 |
| 13 | phy.mtu.edu | 7 | 87400 | 19900 |
 Yahoo |
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | nasa.gov | 9 | 4910000 | 35900000 |
| 3 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 4 | northstar.k12.ak.us | 4 | 6620 | 12300 |
| 5 | nasm.si.edu | 7 | 57800 | 11100 |
| 6 | www-istp.gsfc.nasa.gov | 6 | 10700 | 1200 |
| 8 | historylearningsite.co.uk | 5 | 19700 | 2220 |
| 9 | mos95b.com | |||
| 10 | wpi.edu | 7 | 81100 | 84800 |
| 11 | inventors.about.com | 7 | 82400 | 14000 |
| 12 | ideafinder.com | 5 | 11300 | 876 |
 Bing |
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | nasa.gov | 9 | 4910000 | 35900000 |
| 2 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 3 | nasm.si.edu | 7 | 57800 | 11100 |
| 4 | www-istp.gsfc.nasa.gov | 6 | 10700 | 1200 |
| 5 | gsfc.nasa.gov | 7 | 1290000 | 2330000 |
| 7 | antwrp.gsfc.nasa.gov | 7 | 517000 | 1380 |
| 8 | invent.org | 7 | 27700 | 1200 |
| 9 | phy.mtu.edu | 7 | 87400 | 19900 |
| 11 | daviddarling.info | 3 | 27200 | 15300 |
| 13 | science.nasa.gov | 7 | 180000 | 3750 |
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