A new study of lunar rocks suggests Earth's water might not have come from meteorites

For a long time, scientists assumed that Earth's water was delivered by asteroids and comets billions of years ago. This coincided with the Late Heavy Bombardment (ca. 4.1 to 3.8 billion years ago), a period when planets and bodies in the solar system experienced a much higher rate of impacts.

source https://phys.org/news/2026-01-lunar-earth-meteorites.html