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Google
Rank	Domain	PR	Backlinks	Pages in URL
1	spaceflight.nasa.gov	7	192000	57100
3	spaceflight1.nasa.gov	7	7110	2820
5	human-factors.arc.nasa.gov	6	2860	5310
6	hq.nasa.gov	7	429000	23500
7	shuttle.nasa.gov	6	9600
8	huminfo.arc.nasa.gov	5	202	13
9	nasa.gov	9	4910000	35900000
10	peer1.nasaprs.com	5	414	879
11	iom.edu	8	81400	268000
12	msteacher.org

Yahoo
Rank	Domain	PR	Backlinks	Pages in URL
1	spaceflight.nasa.gov	7	192000	57100
2	nasapeople.nasa.gov	6	1580	945
4	humanfactors.arc.nasa.gov	6	146	774
5	spaceflight1.nasa.gov	7	7110	2820
6	hq.nasa.gov	7	429000	23500
8	vision.arc.nasa.gov	6	1550	4100
9	bedreststudy.com	-
10	mars.jpl.nasa.gov	7	159000	6190
11	imagine.gsfc.nasa.gov	7	43900	4010
12	lisa.jpl.nasa.gov	6	2920	81

Bing
Rank	Domain	PR	Backlinks	Pages in URL
1	spaceflight.nasa.gov	7	192000	57100
3	human-factors.arc.nasa.gov	6	2860	5310
5	spaceflight1.nasa.gov	7	7110	2820
6	humanresearch.jsc.nasa.gov	-
7	shuttle.nasa.gov	6	9600
8	nasapeople.nasa.gov	6	1580	945
9	exploration.nasa.gov	-	12500	341
10	nasajobs.nasa.gov	6	6640	105
12	ohr.gsfc.nasa.gov	-
13	shfe.jsc.nasa.gov	-

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