Scientists discovered that the level of deuterium in comets forming in the Kuiper Belt is nearly identical to the level found in the oceans of Earth. This discovery provides supporting data for which theory? The impact of Earth's gravity on the decay rate of deuterium is the same as the impact of microgravity. The impact of Earth's gravity on the decay rate of deuterium is the same as the impact of microgravity. Most comets formed from deuterium-based water that was stripped away from early Earth by solar radiation. Most comets formed from deuterium-based water that was stripped away from early Earth by solar radiation. Most of the water that forms the oceans of Earth arrived by way of impacts with Kuiper Belt comets. Most of the water that forms the oceans of Earth arrived by way of impacts with Kuiper Belt comets. The Kuiper Belt and the oceans of Earth have proportional evaporation rates based on their distance from the Sun.