There is this new proposal that is quite hot on Area51 now. Scientific Imagination. As it's description says, it is for the people who are interested in questions involving imaginary scenarios and scientific, educational, and fun answers for those questions.
I found some questions that might be on-topic here:
- What would happen if we drilled a tunnel through the Earth along a chord in a great circle?
- If the whole landmass of earth flattened (say, to 30 centimeters above sea level), will we have extra land?
However the difference of this from Stack Exchange science sites is, the proposal is intended to be like what-if.xkcd.com. So it does not only ask for answers, but also invites answerers to let loose their imagination.
Do any of you think this proposal could be a partial duplicate of Earth Science?