 Google |
 |
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | jsc.nasa.gov | 7 | 252000 | 1030000 |
| 2 | nasa.gov | 9 | 4910000 | 35900000 |
| 4 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 5 | spaceflight.nasa.gov | 7 | 192000 | 57100 |
| 6 | space.com | 5 | 3140000 | 94800 |
| 8 | utexas.edu | 8 | 1840000 | 1440000 |
| 9 | space.gs | 4 | 2610 | 2590 |
| 10 | engr.umd.edu | |||
| 11 | iberkshires.com | 5 | 15700 | 23000 |
| 12 | spaceflightnow.com | 7 | 125000 | 17300 |
 Yahoo |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | nasa.gov | 9 | 4910000 | 35900000 |
| 2 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 3 | jsc.nasa.gov | 7 | 252000 | 1030000 |
| 4 | solarsystem.nasa.gov | 6 | 101000 | 11500 |
| 5 | space.gs | 4 | 2610 | 2590 |
| 6 | www1.nasa.gov | 6 | 52500 | 2220 |
| 7 | bbsnews.net | 4 | 7470 | 10600 |
| 8 | science.qj.net | - | ||
| 9 | space.com | 5 | 3140000 | 94800 |
| 10 | i-newswire.com | 3 | 25800 | 14200 |
 Msn |
|
|||
|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | jsc.nasa.gov | 7 | 252000 | 1030000 |
| 2 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 3 | nasa.gov | 9 | 4910000 | 35900000 |
| 5 | astronautix.com | 4 | 64700 | 17700 |
| 6 | solarsystem.nasa.gov | 6 | 101000 | 11500 |
| 7 | space.com | 5 | 3140000 | 94800 |
| 8 | spaceflightnow.com | 7 | 125000 | 17300 |
| 9 | blackamericaweb.com | 6 | 39000 | 49300 |
| 10 | upi.com | 7 | 1190000 | 1020000 |
| 11 | content.usatoday.com | 4 | 697000 | 8850000 |
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