This is kind of a wierd question, so I'll just throw it out there. So I was talking to my mate about BEC a couple of weeks ago and he proposed an interesting idea. I was telling him how BEC was used to slow down light to 38mph, what he suggested was using this concept to move a solar sail. So my question is, would the acceleration gained by light passing through the BEC have a greater impact on the solar sail than the idea of light propulsion already does? I have no idea about things on this kind of level so it would be interesting to know people's opinions on this as BEC is interesting enough as it is.