Leo the Little Astronaut zipped up his shiny silver suit and buckled his helmet tight. Outside his window, the galaxy shimmered like a jar of glowing fireflies. It was time for his nightly mission: to wish the planets goodnight. Leo climbed into his cozy rocket ship, which smelled like warm blankets and stardust. With a gentle hum, the rocket took off, soaring past the moon. First, Leo flew toward Mercury, a tiny gray rock shivering in the dark. 'Goodnight, Mercury,' Leo whispered, tucking a soft shadow over its craters. Next, he visited Venus, wrapped in thick, cloudy blankets. 'Sleep tight, bright Venus,' he said with a smile. As he sailed further, Leo gave a soft wave to the big, beautiful Earth. He felt so lucky to have such a cozy home waiting for him. He continued his journey, drifting past the giant rings of Saturn, which looked like a dusty, sleepy playground. Everywhere Leo traveled, the stars twinkled back at him, blinking slowly as if they were tired, too. He saw Jupiter glowing in the distance and whispered a quiet 'Goodnight' to its swirling storms. The universe was vast and deep, but it felt very safe and friendly. After visiting every neighbor in the solar system, Leo turned his rocket back toward his own bedroom. His eyes felt heavy, and his heart felt full of cosmic wonder. He landed softly on his rug, climbed out of his suit, and snuggled into his bed. He realized that even when you are small, you can make the whole world feel loved and peaceful just by saying goodnight. As he closed his eyes, the constellations hummed a soft lullaby, keeping watch until the sun came up to start a new day.