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Google
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
2	groundreport.com	6	179000	243000
3	gsfc.nasa.gov	7	1290000	2330000
4	science.nasa.gov	7	180000	3750
5	adsabs.harvard.edu	8	329000	12800000
6	nasaimages.org	8	12500	1300000
8	cddis.nasa.gov	6	569	1920
9	ncbi.nlm.nih.gov	8	5990000	22300000
10	sciencemag.org	8	956000	3320000
11	spaceref.com	5	146000	97500

Yahoo
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
3	en.wikipedia.org	8	61800000	3750000
4	jpl.nasa.gov	8	1170000	22300000
5	saturn.jpl.nasa.gov	7	123000	26700
6	marsprogram.jpl.nasa.gov	7	112000	2640
8	solarsystem.nasa.gov	6	101000	11500
9	nssdc.gsfc.nasa.gov	7	105000	24900
10	mars.jpl.nasa.gov	7	159000	6190
11	science.nasa.gov	7	180000	3750
12	dawn.jpl.nasa.gov	7	6870	442

Bing
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
3	science.nasa.gov	7	180000	3750
4	ntrs.nasa.gov	7	30200	2250000
5	spaceflight.nasa.gov	7	192000	57100
7	sti.nasa.gov	-	62000	3180
8	jsc.nasa.gov	7	252000	1030000
9	grin.hq.nasa.gov	6	10600	3150
10	exploration.nasa.gov	-	12500	341
11	images.jsc.nasa.gov	7	31100	36500
12	earthobservatory.nasa.gov	7	207000	35800

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