Earth, asteroids and patatoids - A Dino in the stars

Meet Sylvia in the cafeteria! Huma asks the Egg, hidden in her bag, to be discreet. But it's no use: he's got too many questions. Why is everything in space round? And how does the Moon keep from falling on us? What's all this about gravity? Then off to the Sauverny observatory to look at our satellite through a telescope. But the voice of the Egg is seriously beginning to intrigue Sylvia... Will she discover its secret?