Solar sails – How do they work?

Light has no mass – yet it can push solar sails. How?
It is true that photons do not have “rest” mass. They do have energy  – and hence an associated mass given by m = E/c2. Light has momentum given by p = E/c. In fact, of any body possessing energy E, light has the highest possible momentum, since none of the energy is “diverted” into mass.

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