Nothing you encounter is truly “pristine.” Nearly every atom on our planet has been processed in some way, either by humans, the Sun, Earth’s core, or other influences. But on New Year’s Day 2019, the New Horizons mission flew past one of the most pristine objects in the solar system: Arrokoth, an object far beyond…
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Source : Mysterious Object Beyond Pluto Could Help Explain How Our Solar System Formed
