This could explain why some asteroids that venture into the inner solar system are pale, while most others are stained a darker hue by the bombardment
of space particles (Nature, DOI: 10.1038 / nature08709).
If another pole swap is coming, the process could prove catastrophic for life, disrupting animals» magnetic navigation and letting in
harmful space particles that could fry organic cells and electronic circuits alike.
They occur when
charged space particles, typically from the sun, stream along a planet's magnetic field lines and interact with atmospheric atoms, producing not only optical light but also radio emissions.
«This detector combines the high density of tungsten with the fine spatial resolution of silicon to separate very
closely spaced particles.
North of Norway over the Norwegian and Greenland Seas, the magnetic bubble surrounding the Earth dips inward,
allowing space particles to funnel in toward the planet.