Negative ions are atoms or molecules that have "stolen" an extra electron. While they are a vital component of the plasma that fills the universe, they are notoriously difficult to study. In a first for space exploration, a Chinese-led research team has detected negative hydrogen ions on the moon's surface, solving a long-standing mystery on how the solar wind interacts with airless celestial bodies. The discovery was made by a specia... [2801 chars]
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