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Dazzling 'dawn storms' that illuminate Jupiter's poles are 10x more intense than the gas giant's regular auroras.

With the arrival of a visiting crew still delayed, science and maintenance work on board the International Space Station continued to fill the Expedition 73 crew's week.

A powerful solar flare caused radio blackouts in North America; a CME may graze Earth on June 18, possibly sparking auroras.

No one will disagree with Prof. Alfvén when he stresses the desirability of attempting scale-model experiments of geophysical phenomena in the laboratory. Unfortunately, experience shows that ...