Astronomers Spot Previously Unknown Space 'Cavity' That’s Quietly Protecting the Moon
Gizmodo • • general
Key Points:
- New research published in Science Advances reveals that Earth's magnetosphere provides more extensive protection against harmful cosmic rays to the Moon than previously thought, even when the Moon is outside the magnetosphere.
- Data from China’s Chang’e-4 Moon lander showed a 20% decrease in radiation on the lunar surface during periods when the Moon is opposite Earth’s magnetosphere, indicating an extended shielding effect.
- The study also analyzed data from NASA’s Lunar Reconnaissance Orbiter, which showed similar radiation patterns, supporting the existence of an energetic particle cavity that offers additional protection.
- This enhanced understanding of the magnetosphere’s shielding could help future space missions reduce astronaut radiation exposure, particularly from low-energy ions that contribute significantly to skin dose.
- Despite the shielding, intense solar particle events can still dramatically increase radiation levels, highlighting the complexity of space weather and the need for continued research as missions like NASA’s Artemis prepare for lunar exploration.
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