 Google |
 |
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | pds.jpl.nasa.gov | 7 | 30900 | 69600 |
| 2 | mapaplanet.org | - | ||
| 3 | nasa.gov | 9 | 4910000 | 35900000 |
| 5 | spacemart.com | 3 | 221000 | 8190 |
| 6 | spaceref.com | 5 | 146000 | 97500 |
| 8 | space.com | 5 | 3140000 | 94800 |
| 9 | astrobiology.nasa.gov | 6 | 7900 | 23800 |
| 10 | charlierose.com | 7 | 69800 | 595000 |
| 11 | sciencedaily.com | 8 | 946000 | 131000 |
| 13 | marketwatch.com | 7 | 5940000 | 2300000 |
 Yahoo |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | charlierose.com | 7 | 69800 | 595000 |
| 2 | youtube.com | 9 | 79700000 | 382000000 |
| 3 | planetquest.jpl.nasa.gov | 7 | 24000 | 2160 |
| 4 | solarsystem.nasa.gov | 6 | 101000 | 11500 |
| 5 | video.google.com | 8 | 10800000 | 17700000 |
| 6 | discovermagazine.com | 7 | 370000 | 27100 |
| 7 | sfgate.com | 5 | 2900000 | 2050000 |
| 9 | space.com | 5 | 3140000 | 94800 |
| 10 | planetaryexploration.net | |||
| 11 | hq.nasa.gov | 7 | 429000 | 23500 |
 Msn |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | solarsystem.nasa.gov | 6 | 101000 | 11500 |
| 2 | nasascience.nasa.gov | 8 | 5390 | 2700 |
| 3 | fpd.gsfc.nasa.gov | 6 | 171 | 263 |
| 5 | sse.jpl.nasa.gov | 6 | 6620 | 8880 |
| 7 | stp.gsfc.nasa.gov | 6 | 1830 | 101 |
| 8 | connect.larc.nasa.gov | 6 | 1860 | 628 |
| 10 | nasa.gov | 9 | 4910000 | 35900000 |
| 12 | nasaresearchers.nasaprs.com | - | ||
| 13 | gsfc.nasa.gov | 7 | 1290000 | 2330000 |
| 14 | newfrontiers.nasa.gov | |||
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