■Class discussion: Why did solar winds blow away Mars' atmosphere but not that of the Earth? What protects our atmosphere and us from the solar winds? How are lights that often appear in the skies near the north and south poles related to solar wind and the force that protects the Earth? What problems do the radiation spikes from solar storms sometimes cause for us on Earth? How are spacecraft and astronauts affected by solar radiation? Could spacecraft ever sail on the solar wind?
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