The concept of solar sailing using sunlight propelling thin membrane structure has been proposed for a long time. The principle of this technology is accumulating velocity to reach a very high speed which may up to 10% speed of light based upon the fact that object could be consistently accelerated even by a tiny force in outer space environment. In 2010, solar sailing was confirmed by IKAROS of JAXA. In this paper, two kinds of propulsive mechanism are mentioned. One propulsive way is based upon the momentum exchange of photons and solar sails. The other propulsive scheme which uses special-made graphene material emitting electrons exhibits a great potential. The former scheme based upon momentum exchange is relatively persistent and stable but requires a large reflecting surface area at the same time. The latter scheme could provide a several orders larger propulsive force although there are engineering difficulties need to be overcome. The values of acceleration due to two propulsive schemes respectively are compared to illustrate the propulsive efficiency. It is believed that if the latter technology matures and these two propulsive ways could be combined comprehensively, a combined light propelling system with better performance would be possible in the future.
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