One piece of evidence supporting the idea that water on Earth may have come from comets is the presence of deuterium, a heavy form of hydrogen, in Earth's oceans. Comets are known to have a higher ratio of deuterium to hydrogen compared to Earth's oceans, suggesting that comets could have contributed to Earth's water. Additionally, the isotopic composition of water on Earth and in comets is similar, indicating a possible connection. Further, studies of ancient ice cores from Greenland have shown that comets have impacted Earth throughout history, potentially delivering water to the planet.
There are several lines of evidence that support the idea that water on Earth may have come from comets. Firstly, the isotopic composition of water on Earth closely matches that of comets, suggesting a common origin. Secondly, the discovery of water ice on comets, as observed by space missions, further supports this idea. Additionally, the presence of complex organic molecules and other elements commonly found in comets also points to their involvement in Earth's water supply. Finally, computer models of our solar system's early formation show that comets could have delivered significant amounts of water to our planet.
The idea that water on Earth may have come from comets is supported by several lines of evidence. First, the chemical composition of water found on Earth matches that of water found in certain comets. Secondly, the ratio of hydrogen to deuterium in Earth's water is similar to that found in comets. Additionally, the detection of water vapor and other volatiles in the coma, or atmosphere, of comets provides direct evidence of water on these celestial bodies. Finally, the presence of organic compounds in comets suggests that they may have delivered not only water but also the building blocks of life to Earth.
