1. If trends continue, solar energy prices could be competitive with coal by 2020.

    Get ready for a massive renewable energy boom

     

  2. Take a look at NASA’s new solar-powered ion propulsion engine

    If we’re ever going to explore the universe’s far corners in cool spaceships that look like giant pizza cutters, we’re first going to need more efficient engines. On Tuesday, NASA took the wraps off a potential next-gen thruster system that looks like something described in Trekkie fanfic: A solar-electric ion propulsion engine.

     

  3. As the moon passes the sun, the ghostly tendrils of the outer atmospheric layer, the “corona,” are visible, providing scientists a moment of focused attention on our mysterious star. 

    7 stunning images from Australia’s rare total solar eclipse