Explorers

Okay, let's take a look at this craft. First, the sails are far, far too small. Current projections are that a ship of this kind of size would need sails hundreds of miles across, at the very least. And this is not something that you can improve with future technology - the sun is the sun, it only exerts so much pressure on a sail no matter how advanced it is. Second, how did this thing ever take off? How is it supposed to land? It's made of wood! It couldn't possibly have survived an atmospheric re-entry.