The advantages are numerous: by acting like a sailing ship in space ... CubeSa unfurled its 860-square-foot sail in a low-Earth orbit on August 29 after launching into space on April 23.

Today, LightSail 2 is slated to unfurl its massive solar sail in orbit, starting at 2:40 p.m ... sails resemble the sails of water-skimming ships in form and function. They're designed to merge ...

then tack again edge-on with each orbit. It’s just like a sailing ship except it’s in space, driven directly by sunlight. And instead of being built in an enormous shipyard by the sea ...