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Space & Planetary Science

A perfect sun-storm

A geomagnetic storm on January 17, 2013, provided unique observations that finally resolved a long-standing scientific problem. For decades, scientists had asked how particles hitting Earth's magnetosphere were lost. A likely mechanism…

Cosmic dust demystified

The solar system is a dusty environment, with trillions of cosmic dust particles left behind by comets and asteroids that orbit the sun. All this dust forms a relatively dense cloud through which Earth travels, sweeping up the…