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On May 21, 2010, Japan launched the first successful solar sail Ikaros into space.
Solar sail technology uses light for spacecraft propulsion, but not in the same way that traditional solar panels do. While solar panels use light to generate electricity, spacecraft with solar sails rely only on the light itself to cruise through outer space. Particles of light called photons actually push the spacecraft forward. A single photon can’t accomplish this on its own, but with enough photons striking a spacecraft, propulsion is possible—you just need a big surface to catch all that light.
The Ikaros solar sail launched by the Japan Aerospace Exploration Agency. (Image credit: JAXA)Scientists have been toying with this idea since the 1800s, but Japan finally proved that it was possible when the country launched the Ikaros mission. The mission’s name stands for Interplanetary Kite-craft Accelerated by Radiation of the Sun. This experimental spacecraft had a 2,100-square foot sail that looked like a giant space kite.
Japan’s space agency was also able to steer the spacecraft by controlling the orientation of liquid crystals in LCD panels that were built into the solar sail. Ikaros sailed all the way to Venus in just six months before continuing on its orbit around the sun.
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Hanneke Weitering is an editor at Space.com with 10 years of experience in science journalism. She has previously written for Scholastic Classroom Magazines, MedPage Today and The Joint Institute for Computational Sciences at Oak Ridge National Laboratory. After studying physics at the University of Tennessee in her hometown of Knoxville, she earned her graduate degree in Science, Health and Environmental Reporting (SHERP) from New York University. Hanneke joined the Space.com team in 2016 as a staff writer and producer, covering topics including spaceflight and astronomy. She currently lives in Seattle, home of the Space Needle, with her cat and two snakes. In her spare time, Hanneke enjoys exploring the Rocky Mountains, basking in nature and looking for dark skies to gaze at the cosmos.
