Reference Jump up
↑ Yeomans, Donald K. (2006-07-13). "NASA JPL HORIZONS System trace." when the 2007-8-8. — At the site, go to the "web interface" then select "Ephemeris Type: ELEMENTS", "Target Body: Mars" and "Center: Sun".
↑ Jump up to: Kenneth Seidelmann, P. 2.1 2.0; Archinal, B. A., F. M. A'hearn;; et.al., (2007). "Report of the IAU/IAGWorking Group on cartographic coordinates and rotational elements: 2006". Celestial Mechanics and Dynamical Astronomy 90: 155–180. doi:10.1007/s10569-007-9072-y. Search on 2007-08-28.
Jump up ↑ Ashley Yeager (July 19, 2008). "Impact May Have Transformed Mars" ScienceNews.org. trace on 2008-08-12.
Jump up ↑ Ian Sample (June 26, 2008). "Cataclysmic impact created north-south divide on Mars" Science @ guardian.co.uk. trace on 2008-08-12.
Jump up ↑ David R. Williams (September 1, 2004). "Mars Fact Sheet" National Space Science Data Center. NASA. trace on 2006-06-24.
Peplow, Mark Jump up ↑. "How Mars got its rust" trace on 2007-03-10.
Jump up ↑ http://www.thairath.co.th/news.php?section=technology&content=39569
Jump up ↑ http://www.posttoday.com/breakingnews.php?sec=breaking&id=193073
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