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Google
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
3	en.wikipedia.org	8	61800000	3750000
4	youtube.com	9	79700000	382000000
5	america.gov	8	105000	75000
6	wikiwebshow.com	-
7	science.discovery.com	7	1820000	5520
8	americanthinker.com	7	825000	42600
9	space.com	5	3140000	94800
10	newfrontiersblog.blogspot.com	4	2270	254
12	hq.nasa.gov	7	429000	23500

Yahoo
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
3	en.wikipedia.org	8	61800000	3750000
4	youtube.com	9	79700000	382000000
5	space.com	5	3140000	94800
6	science.discovery.com	7	1820000	5520
7	ston.jsc.nasa.gov	7	545	471
9	nasaspaceflight.com	5	38800	31700
11	encarta.msn.com	8	1260000	3460000
12	dir.yahoo.com	8	1640000	1540000
13	floridareview.co.uk	-	357	302

Bing
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
3	en.wikipedia.org	8	61800000	3750000
4	www1.nasa.gov	6	52500	2220
5	youtube.com	9	79700000	382000000
6	blogs.orlandosentinel.com	5	454000	67000
7	spaceref.com	5	146000	97500
9	spacecoalition.com	6	10600	1450
10	happynews.com	6	32700	5770
14	mahalo.com	6	297000	185000
15	pmchallenge.gsfc.nasa.gov	4	333	1030

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