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Google
Rank	Domain	PR	Backlinks	Pages in URL
1	spaceflight.nasa.gov	7	192000	57100
3	shuttle.nasa.gov	6	9600
4	hq.nasa.gov	7	429000	23500
5	nasa.gov	9	4910000	35900000
7	spacepolitics.com	4	54100	2080
8	space.com	5	3140000	94800
10	spaceflight1.nasa.gov	7	7110	2820
11	spaceoperations.nasa.gov	8	607	863
12	msteacher.org
13	aviationweek.com	7	126000	40000

Yahoo
Rank	Domain	PR	Backlinks	Pages in URL
1	spaceflight.nasa.gov	7	192000	57100
2	nasa.gov	9	4910000	35900000
3	hq.nasa.gov	7	429000	23500
5	spaceflight1.nasa.gov	7	7110	2820
7	genesismission.jpl.nasa.gov	6	3430	1230
8	folklife.si.edu	-
9	eol.jsc.nasa.gov	7	31300	892000
10	space.com	5	3140000	94800
11	science.nasa.gov	7	180000	3750
13	en.wikipedia.org	8	61800000	3750000

Bing
Rank	Domain	PR	Backlinks	Pages in URL
1	spaceflight.nasa.gov	7	192000	57100
2	spaceflight1.nasa.gov	7	7110	2820
4	shuttle.nasa.gov	6	9600
5	hq.nasa.gov	7	429000	23500
6	nasajobs.nasa.gov	6	6640	105
7	www-pao.ksc.nasa.gov	-	30000	10800
9	en.wikipedia.org	8	61800000	3750000
11	earthobservatory.nasa.gov	7	207000	35800
12	ksc.nasa.gov	7	112000	60500
13	space.com	5	3140000	94800

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