Assertion: spacecraft's velocity | /r/HasProperty | obtained by solar sails
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Source sentences:
text: Velocities of 0.05% the speed of light could be obtained by solar sails carrying 10 kg payloads, using thin solar sail vehicles with effective areal densities of 0.1 g/m2 with thin sails of 0.1 µm thickness and sizes on the order of one square kilometer.