The Apollo moon missions ended almost 40 years ago. But for lunar scientists, they’re gifts that keep on giving. Researchers studying rocks brought back by astronauts have found that the moon’s scarce water has a different chemical signature than Earth water. Which leads to the conclusion that the water probably came from comets. The study appears in the journal Nature Geoscience . [James Greenwood et al., " Hydrogen isotope ratios in lunar rocks indicate delivery of cometary water to the Moon "] [More]













Scientific American - Space