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Google
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
2	voyager.jpl.nasa.gov	7	19200	3680
3	saturn.jpl.nasa.gov	7	123000	26700
4	starchild.gsfc.nasa.gov	7	27800	1790
5	news.bbc.co.uk	9	15200000	3360000
7	kidscosmos.org	4	891	222
8	foxnews.com	7	4500000	1290000
10	hq.nasa.gov	7	429000	23500
11	msnbc.msn.com	8	11600000	828000
12	abc.net.au	8	1580000	23200000

Yahoo
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
2	starchild.gsfc.nasa.gov	7	27800	1790
4	en.wikipedia.org	8	61800000	3750000
5	sciencedaily.com	8	946000	131000
6	nssdc.gsfc.nasa.gov	7	105000	24900
7	vttoth.com
8	history.nasa.gov	7	47700	16700
9	space.com	5	3140000	94800
11	blog.spectrum-scientifics.com	-
12	nmp.jpl.nasa.gov	6	7820	329

Bing
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
2	msnbc.msn.com	8	11600000	828000
3	starchild.gsfc.nasa.gov	7	27800	1790
4	dsc.discovery.com	7	1270000	33500
5	grin.hq.nasa.gov	6	10600	3150
6	saturn.jpl.nasa.gov	7	123000	26700
8	computerworld.com	5	3400000	469000
9	space.com	5	3140000	94800
11	ulysses.jpl.nasa.gov	7	6480	191
13	en.wikipedia.org	8	61800000	3750000

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