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Our sun and our solar system were formed via a process of star formation that still occurs to this day in other regions of our galaxy.
The impetus may have been the shock wave from a supernova but the materials existing within the nebula from which our sun and solar system coalesced would have included all the necessary basic elements needed to create other heavier elements over time due to the effects of heat or lack of, pressure and gravity.
As a result during the formation large amounts of water ice were created in the outer regions of our solar system.
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