Goddard Space Flight Center

NASA/Goddard Space Flight Center. મેળવેલ 2006-06-20. "Venus: Facts & Figures". NASA. મૂળ માંથી 2006-09-29 પર સંગ્રહિત. મેળવેલ 2007-04-12. "Space Topics:...

Merriam-Webster Online. મેળવેલ 2008-06-12. "Mercury Fact Sheet". NASA Goddard Space Flight Center. November 30, 2007. મેળવેલ 2008-05-28. "The MeanPlane (Invariable...

11, 2011 from NASA's International Solar-Terrestrial Physics Goddard Space Flight Center website. Donatelle, Rebecca J. (2005). Health, the Basics (6th આવૃત્તિ)...

(2001-10-18). "Weather Forecasters May Look Sky-high For Answers". Goddard Space Flight Center (NASA). મૂળ માંથી 2009-06-27 પર સંગ્રહિત. મેળવેલ 2011-02-08....