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 | University of New South Wales |
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"A Geometric Determination of the Distance to the Galactic Center" | Levison, Martin J Duncan 1997 |
, "", 2002 Journal of Geophysical Research Space Physics , Volume 107, Issue A7, pp | Quarterly Journal of the Royal Astronomical Society |
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University of New South Wales | Astronomical Society of the Pacific Conference Series |