In a potential step toward sending small spacecraft to the stars, researchers have developed an ultra-thin, ultra-reflective membrane designed to ride a column of laser light to incredible speeds.
Since its launch in 1977, NASA’s Voyager 1 spacecraft has traveled over 15 billion miles into deep space. That’s a long way—but it’s not even 1% of the distance to Alpha Centauri, the nearest star to the sun. If humans are going to send ships to the stars, space travel will have to get a lot faster.
One promising way to pick up that kind of speed is a “lightsail”—a thin, reflective membrane that can be pushed by light much the same way that wind pushes a sailboat. Lightsails have the potential to reduce flight time to nearby stars from several thousand years using current propulsion systems to perhaps just a decade or two.