What does the universe consist of?

Hmm, we already have one astronomy lesson per week. Although, I don't really see any practical use for it. (The eternal question - how will this be useful in life? Well, of course, if you're not planning to become an astronaut:), which is unlikely.) So, I just sit lazily in class, listening to lectures about quadratures and longitudes... It's only interesting when there's an opportunity to argue about the origin of the world. Of course, at that moment, I start proving something unscientific; I even almost managed to convince the teacher that the Earth is actually flat (and it is! =р), to the point where she herself started to doubt it:smile43: