light sails

Light sails are a method of spacecraft propulsion that uses the momentum of sunlight or laser beams to propel a very large, lightweight mirror-like surface called a sail. When photons from the Sun or a laser hit the sail, they transfer momentum, exerting a tiny but continuous push. Over time, this gentle force can accelerate the spacecraft to high speeds without the need for traditional fuel. Light sails are promising for long-distance space travel because they can operate for extended periods, harnessing abundant solar energy, enabling missions to distant planets or beyond within human lifetimes.