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Google
Rank	Domain	PR	Backlinks	Pages in URL
1	history.nasa.gov	7	47700	16700
3	spaceflight.nasa.gov	7	192000	57100
4	nasa.gov	9	4910000	35900000
6	centennialofflight.gov	6	16100	6550
7	en.wikipedia.org	8	61800000	3750000
8	jsc.nasa.gov	7	252000	1030000
10	www-pao.ksc.nasa.gov	-	30000	10800
11	space.about.com	6	33300	17000
13	hq.nasa.gov	7	429000	23500
15	video.google.com	8	10800000	17700000

Yahoo
Rank	Domain	PR	Backlinks	Pages in URL
1	history.nasa.gov	7	47700	16700
2	nasa.gov	9	4910000	35900000
4	jsc.nasa.gov	7	252000	1030000
5	en.wikipedia.org	8	61800000	3750000
6	sse.jpl.nasa.gov	6	6620	8880
7	ueet.nasa.gov	5	609	55
8	spaceflight1.nasa.gov	7	7110	2820
9	centennialofflight.gov	6	16100	6550
10	encyclomedia.com	4	1040	2110
11	grchistory.grc.nasa.gov	5	322	3

Bing
Rank	Domain	PR	Backlinks	Pages in URL
1	hq.nasa.gov	7	429000	23500
3	nasa.gov	9	4910000	35900000
4	history.nasa.gov	7	47700	16700
6	spaceflight.nasa.gov	7	192000	57100
7	jsc.nasa.gov	7	252000	1030000
9	science.ksc.nasa.gov	6	36500	25300
10	dfrc.nasa.gov	7	26800	13200
11	grchistory.grc.nasa.gov	5	322	3
12	sse.jpl.nasa.gov	6	6620	8880
13	www-pao.ksc.nasa.gov	-	30000	10800

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