Evidence supporting the idea that water on Earth may have originated from comets includes the analysis of cometary compositions, which often show high levels of water ice and similar isotopic signatures to Earth's oceans. For example, studies of comets like 67P/Churyumov-Gerasimenko, analyzed by the Rosetta mission, revealed a significant amount of water vapor that closely matched Earth's isotopic ratios, suggesting a shared origin. Additionally, the timing of heavy cometary bombardment in the early Solar System aligns with the period when Earth was forming, providing a plausible mechanism for delivering water to our planet. This supports the theory that impacts from such bodies contributed to Earth's current water supply.
In three to five sentences, explain the evidence that supports the idea that water on Earth may have come from comets.(4 points)
RUBIC
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