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Table 1.

Example materials for light sails.

Material ρ [kg m3] κrad
Aerographite 0.18 ∼1 4.27 × 10−3 m
Carbon nanofoam 2 ∼1 3.85 × 10−4 m
Mylar film 1390 ∼1.9 1.05 × 10−6 m
Aluminum foil 2700 ∼1.8 5.13 × 10−7 m
Sand (SiO2) 2600 ∼1 2.96 × 10−7 m

Notes. Columns give typical mass volume densities (ρ), radiation coupling constants (κrad), and resulting characteristic length (or thickness) as σκrad/ρ. Detailed properties of aerographite were described by Mecklenburg et al. (2012), those of carbon nanofoam by Rode et al. (2000).

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