Called a "solar sail," the silvery sheet of fabric is 32 times thinner than a human hair and stretches the size of three basketball courts. Over a recent Zoom call, Johnson says the sheet of fabric works much like a sail used for boats—if a boat sail were designed for high-speed space travel. "Just as a sailboat uses the wind to push it through the water, solar sails use the pressure of sunlight to push them through space," Johnson says.
This seemingly impossible feat is, in fact, not impossible at all. Avi Loeb, an astrophysicist and Director of the Institute for Theory and Computation at the Center for Astrophysics at Harvard University, says solar sails represent one of the most promising technologies for future space exploration. They offer a sustainable and efficient way to navigate the cosmos, with the potential to propel spacecraft to unprecedented speeds and distances.
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