Stardust and Princess Twilight's school

After dinner Stardust went up to her room to study astronomy, the study of stars, planets, and space. She was hoping to get into Princess Twilight's school for extraordinary foals. Then she looked through her telescope and named all the planets. Suddenly she felt a shiver and a weird sensation on her flank. Then she shouted, "I HAVE MY CUTIE MARK!!!!" And all of her family, her brother,sister and parents, all bolted up to her room to see what was up.