Key Takeaways
1. A recent NASA study challenges the idea that meteorites delivered a large portion of Earth’s water.
2. The study used a new analysis technique focused on oxygen-isotope measurements from lunar regolith.
3. Traditional methods relied on elements attracted to metals, which can be contaminated over time.
4. The findings suggest that late meteorites contributed significantly to the Moon’s water but minimally to Earth’s oceans.
5. Researchers are excited about future lunar samples from upcoming missions like Artemis III.
The origin of Earth’s water has long puzzled scientists. While earlier research suggested that meteorites could have delivered a large portion of Earth’s water, a recent study by NASA presents a different perspective.
New Analysis Technique
In this investigation, the team employed an innovative approach to evaluate lunar regolith collected during the Apollo missions. Lunar regolith refers to the fine particles that blanket the surface of the Moon. The researchers utilized a method based on oxygen-isotope measurements.
Traditionally, scientists have focused on analyzing elements that are drawn to metals. However, this approach is not very reliable, since the repeated impacts on the Moon can lead to contamination and mixing of these elements over time. Conversely, the oxygen-isotope method benefits from the fact that oxygen remains unaffected by external influences. Furthermore, oxygen is the most abundant element by mass in rocks.
Implications for Earth
The findings indicated that the volume of water brought by late meteorites (those that reached Earth more than four billion years ago) was substantial for the Moon. Nevertheless, when considering the larger scale of Earth’s oceans, these results suggest that the contribution was minimal for Earth.
This research was published in the Proceedings of the National Academy of Sciences. Scientists are fascinated by the insights gained from samples collected over 50 years ago. They are eager for the new samples that will be gathered from upcoming missions like Artemis III.
Proceedings to the National Academy of Sciences via NASA.
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