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Losing air

New study finds a barrage of small impacts likely erased much of the Earth’s primordial atmosphere.

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This image shows a color-coded geographic representation of ultra-relativistic electron fluxes, based on orbital tracks of the Van Allen Probe B spacecraft projected onto the geographical equatorial plane. As the spacecraft precesses in its elliptical orbit around the Earth, it forms a “spirograph” pattern in the Earth-centered coordinate system. Inside of this radial distance is an almost com...

Plasma shield

Researchers find that Earth’s “plasmaspheric hiss” protects against a harmful radiation belt.

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