One key piece of evidence supporting the idea that water on Earth may have come from comets is the similarity in the isotopic composition of water found on comets and Earth. The ratio of deuterium (a heavy isotope of hydrogen) to hydrogen in water on comets is similar to that found in Earth's oceans. Additionally, the discovery of organic molecules, such as amino acids, on comets provides further support, as these molecules are essential building blocks for life as we know it. Lastly, the detection of water vapor in the tails of comets as they approach the Sun suggests that comets contain significant amounts of water, which could have been delivered to Earth through impacts.
The evidence supporting the idea that water on Earth may have come from comets includes the observation that comets are rich in water ice. Comets are composed of a mixture of water, dust, and other organic compounds, and when they collide with Earth, they release water vapor into the atmosphere. Isotopic analysis of water found on Earth and in comets also suggests that their water shares similar characteristics, indicating a potential common origin. Additionally, the detection of organic molecules, such as amino acids, in comets further supports the hypothesis that comets brought water and the building blocks of life to Earth.
The idea that water on Earth may have come from comets is supported by a few key pieces of evidence. First, the composition of water on comets closely resembles that of water on Earth, both isotopically and chemically. Second, analysis of the water trapped in ancient rocks suggests that it has an extraterrestrial origin. Finally, the discovery of organic molecules and amino acids, which are the building blocks of life, in the tails of comets further supports the idea that water from comets could have provided the necessary ingredients for life on Earth.
