Seamus and Dean, who were working nearby, sniggered loudly, though not loudly enough to mask the excited squeals from Lavender Brown - "Oh Professor, look! I think I've got an unaspected planet! Oooh, which one's that, Professor?"
"It is Uranus, my dear," said Professor Trelawney, peering down at the chart.
"Can I have a look at Uranus too, Lavender?" said Ron.
Most unfortunately, Professor Trelawney heard him, and it was this, perhaps, that made her give them so much homework at the end of the class.