| "An Account of the Discovery of Two Satellites Revolving Round the Georgian Planet" | The date is based on the oldest found to date in , and is thought to be the date of the formation of the first solid material in the collapsing nebula |
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| "A Geometric Determination of the Distance to the Galactic Center" | and the Cassini Imaging Team July 18, 2007 |
The Proceedings of the IAU 8th Asian-Pacific Regional Meeting, Volume I.
20| Sukyoung Yi; Pierre Demarque; Yong-Cheol Kim; Young-Wook Lee; Chang H | |
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| Philosophical Transactions of the Royal Society of London | "The origin and evolution of the solar system" |
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18| "Chondrule-forming Shock Fronts in the Solar Nebula: A Possible Unified Scenario for Planet and Chondrite Formation" | Levison, Martin J Duncan 1997 |
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| 08 and 1 Solar mass, of which there are billions in the Milky Way | Celestial Mechanics and Dynamical Astronomy |
"The age of the solar system redefined by the oldest Pb-Pb age of a meteoritic inclusion.