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 Google |
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | freespaceoptics.org | |||
| 2 | optics.nasa.gov | - | ||
| 3 | tessco.com | 6 | 3130 | 157000 |
| 4 | gsfctechnology.gsfc.nasa.gov | 6 | 180 | 275 |
| 5 | ieeexplore.ieee.org | 9 | 224000 | 4570000 |
| 7 | mae.pennnet.com | 6 | 35400 | 12300 |
| 9 | jhuapl.edu | 7 | 107000 | 59100 |
| 11 | adsabs.harvard.edu | 8 | 329000 | 12800000 |
| 13 | aes.itt.com | 5 | 883 | 133 |
| 14 | en.wikipedia.org | 8 | 61800000 | 3750000 |
 Yahoo |
|
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | space.com | 5 | 3140000 | 94800 |
| 2 | theblackvault.com | 5 | 8340 | 11200 |
| 3 | solarstorms.org | - | ||
| 4 | spacewar.com | 6 | 245000 | 21400 |
| 5 | spacemart.com | 3 | 221000 | 8190 |
| 6 | cruisemates.com | 3 | 6190 | 51900 |
| 7 | nasa.gov | 9 | 4910000 | 35900000 |
| 8 | techbriefs.com | 6 | 7870 | 13500 |
| 9 | spacedaily.com | 4 | 249000 | 24300 |
| 10 | scribd.com | 7 | 1110000 | 9600000 |
 Bing |
|
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | space.com | 5 | 3140000 | 94800 |
| 3 | abovetopsecret.com | 5 | 65000 | 431000 |
| 4 | rense.com | 6 | 271000 | 21700 |
| 5 | connect.larc.nasa.gov | 6 | 1860 | 628 |
| 6 | defensetech.org | 7 | 534000 | 6150 |
| 7 | blog.wired.com | 8 | 2720000 | 76000 |
| 8 | fas.org | 7 | 502000 | 127000 |
| 9 | nasawatch.com | 4 | 102000 | 10400 |
| 10 | alternet.org | 7 | 1140000 | 527000 |
| 11 | spacepolitics.com | 4 | 73200 | 2620 |
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