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Google
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
3	gsfc.nasa.gov	7	1290000	2330000
4	ksc.nasa.gov	7	112000	60500
5	education.nasa.gov	7	27000	482
6	hq.nasa.gov	7	429000	23500
8	www1.nasa.gov	6	52500	2220
9	solarsystem.nasa.gov	6	101000	11500
10	thesun.co.uk	7	1040000	1190000
11	adswww.harvard.edu	8	21500
12	mars.jpl.nasa.gov	7	159000	6190

Yahoo
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
6	mpfwww.jpl.nasa.gov	7	23700	1590
7	worldwind.arc.nasa.gov	7	38300	2550
8	spaceflight1.nasa.gov	7	7110	2820
9	antwrp.gsfc.nasa.gov	7	517000	1380
10	saturn.jpl.nasa.gov	7	123000	26700
11	news.yahoo.com	8	95900000	11200000
12	en.wikipedia.org	8	61800000	3750000
14	spaceflight.nasa.gov	7	192000	57100
16	earthobservatory.nasa.gov	7	207000	35800

Bing
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
3	saturn.jpl.nasa.gov	7	123000	26700
4	gsfc.nasa.gov	7	1290000	2330000
5	spaceflight.nasa.gov	7	192000	57100
6	nasa-sports.com	4	768	236
7	mars.jpl.nasa.gov	7	159000	6190
8	marsrovers.jpl.nasa.gov	6	94900	38700
9	history.nasa.gov	7	47700	16700
10	pao.gsfc.nasa.gov	-	19200
11	jpl.nasa.gov	8	1170000	22300000

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