As long as "hole" in sail is < 1/2 the light wavelength, the sail appears solid to incoming photon) "Perforated" Solar Sail - Similar to microwave "hole" concept, but for Solar / Laser Sail (Holes ~0.2 µm) Magnetic Sail (MagSail) (Momentum from solar wind "pushes" against magnetic field produced by MagSail, which is actually a ring of superconducting cable) Particle Beam (Macroscopic pellets or microscopic particles "push" vehicle) Various analogs to...

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