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Antarctica! 
He stopped leaning against the desk. "Let's begin, then. As you learned last year, the term 'astronomy' encompasses a large number of very different sciences. Does anyone know, perhaps even remember, the name of the scientific discipline that deals with the large-scale structure of the Universe, as well as, by extension, its origins?"
Oh, I should know this! He closed his eyes and mimed writing in the air. It helped him remember his notes from last year.
Origins... structure... universe... cosmology? That's too vague--which kind? Metaphysical, no. Just physical? Perhaps...
Seeing that he wasn't the only one to be unsure, he stuck up both hands into the air to be called on. "
I feel like it's physical cosmology, Sir, but I could be way off."
Could be? He probably was. But it can't hurt to give it a shot, especially when Hufflepuff was already in last place.