Water is the most essential substance for the birth and continuation of life, and Earth is very fortunate to have an abundant supply of it. However, the question of where the planet's vast water resources come from remains a mystery.

Scientists have put forward a variety of hypotheses about the origin of Earth's water resources, but one widely accepted theory suggests that they came from the impact of asteroids and comets.

According to this theory, many asteroids and comets formed at the beginning of the solar system, and as the gravitational pull of the inner solar system stabilized, these objects gradually returned to the inner solar system and impacted the inner bodies, bringing large amounts of water to Earth.

However, a recent study suggests that Earth's water resources may have been on the planet all along. Current speculation on the origin of Earth's water resources is tied to impacts, either by Mars-sized rocks hitting Earth and bringing with them a plentiful supply of water, or by a steady stream of asteroids and comets.

When scientists recently analyzed the lunar rocks brought back by the Apollo missions, they found that the radioactive elements of the Moon and Earth decayed in essentially the same way, with no large gaps.

This conclusion contradicts the theory that giant celestial bodies impacted Earth, as the radioactive elements of Earth and Moon decay essentially the same way. Therefore, Earth and Moon originated from the same material they were initially composed of, and no significant celestial fusion or impact occurred.

This would only be possible if the giant celestial body that impacted Earth was the same age as the Earth and Moon.

But Earth's water resources appeared 4.4 billion years ago, and if the object that hit the Earth had only done so during this time, the Sun, which had already formed, would have evaporated the water from the celestial bodies. Hence, it is unlikely that the impact brought such an abundance of water to Earth, even if it had occurred.

Although the new findings from the lunar rocks brought back during the Apollo missions are not sufficient to deny the impact origin theory of water resources, they do place additional constraints on the rocks that impacted Earth.

While the origin of Earth's water resources is still being studied, the discovery of water on other celestial bodies in our solar system has provided new insights. For example, the discovery of water ice on the Moon, Mars, and some of the icy moons of Jupiter and Saturn suggests that water may have been a common ingredient during the formation of our solar system.

Another theory about the origin of Earth's water resources is that it may have been delivered by the solar wind. The solar wind is a stream of charged particles that is constantly emitted by the Sun. The solar wind contains hydrogen, which could have reacted with oxygen on the early Earth to form water.

The origin of Earth's water resources remains one of the planet's mysteries, and while impacts can bring sufficient water resources, they also make the formation of Earth more complicated. Scientists have not yet found conclusive evidence to support the impact theory.

It is crucial to continue studying and exploring the origins of Earth's water resources to better understand the planet's past and future.