sun stories

 
Solar sails harness the pressure of the solar wind to propel spacecraft across the solar system essentially for free, without the need for engines or fuel. An electric solar sail works more or less the same way, except without the sail: all you need are a bunch of wires.
 
This ultraviolet image of the sun, courtesy of the NASA Solar Dynamics Observatory (SDO), is helping scientists better understand violent solar outbursts. These eruptions are sometimes so powerful they disrupt Earth's global positioning systems and electrical grids....
 
The entire sun experienced a series of violent explosions back in August. And thanks to a new sun-observing satellite, NASA captured the whole thing. Not only are the images amazing, but they also helped researchers determine that solar activity occurring simultaneously may not always be a coincidence.

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