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Researchers found that 3I/ATLAS has a deuterium-to-hydrogen ratio much higher, 30 times more than any comet here and almost 40 times what's in Earth's oceans.
These findings, made possible by Chile's ALMA telescope, suggest it was born somewhere extra cold and far from strong radiation.
As study co-author Teresa Paneque-Carreo put it, "This is proof that the conditions that shaped our solar system are not universal," and "Planetary systems can form in very different environments across the galaxy," reminding us just how diverse our universe really is.