In the attic room, where the ceiling glowed in the dark with stick-on stars, Lila was drawing planets with a thick blue crayon. Olek sat at a small telescope on the windowsill and whispered: "I see Orion.... I see the Great Cart... o! What's that?" A new dot was twinkling in the sky, right between three stars arranged like a triangle. It blinked evenly, as if counting: one, two, three, pause.... one, two, three. "Let's write it down in the Cosmologist!" - exclaimed Lila and opened a notebook with a cover in moons. Olek was already running to the big hoover box. From the box they made a rocket. It had a window made of foil, a steering wheel made of a plastic plate and seat belts made of red ribbon. On the side was written in glitter: SPARK. Grandpa once brought them an old, shiny button. He said it was "an airline jacket button". Lila stuck it next to the steering wheel and called it the Start Button. That evening the Start Button itself lit up with a soft golden light. "Oh dear..." - whispered Olek. The cardboard box rustled quietly, like a tree falling asleep. Dust particles flashed in the window, which for a moment looked like small comets. A soft voice resounded inside: "Good morning. This is the ship Spark. Mode: whisper. Please fasten your seat belts." Lila and Olek looked at each other. Their hearts were beating fast, but joyfully. "Just one minute, children!" - called out mum from the kitchen. Lila fastened the ribbon, Olek corrected the steering wheel. A flicker, their cat, stretched on the carpet and purred, as if wishing them a good journey. The Start button fluttered with light. Sparkle floated silently, like a feather. The walls of the room became transparent. Outside the rocket's window, night spilled in - a real night, with a thousand sparkles. The earth looked like a blue spinner that someone had spun in a big bowl. They flew through a garden of satellites that twinkled like lights on a Christmas tree. They passed a cloud of silver dust - it looked like icing sugar. The little biscuit crumbs that Olek had in his pocket suddenly began to swim and wink at them funny, and Lila caught them like goldfish. "Attention. There's a flock of fireflies approaching." - Sparks said. Green little dots with long, light-coloured tails swam through the window. One of them waved at Lila. The children waved back and the skylight traced a heart in the sky. Suddenly, from a star-shaped pocket radio that Lila had made from cardboard, came: "beep... beep-beep... biiiip." The melody was familiar. It was a song that her grandmother hummed as she fell asleep. "Hello?" - Lila pressed the radio to her ear. "It's Lila and Olek. Where are you?" The loudspeaker buzzed, and then a soft voice rang out: "This is Bullet ... smallest planet... I need..." Krr... crackle... silence. "Ball?" - Olek furrowed his brow. - "After all, on our map Kuleczka is far away and hardly anyone flies to it." "A trace has been received," murmured Spark. A shiny dotted line appeared on the glass of the window, like scattered glitter. - "Direction: ball. Track: smooth. Surprises: possible." Lila felt she had to fly there. Not because someone told her to, but because it was important in the same way that a hug was important. Olek nodded. "We are the captains. Let's fly." Sparks darted through a belt of soft gas clouds. On the left they passed a moon that looked like a smile. On the other side stretched a darker space, calm as a blanket. At its edge hung a ribbon of light - a tunnel of white dots and blue dashes, like a cosmic slide. "I have no data," Spark said quite seriously. - "Captain's decision." Lila tightened her hands on the steering wheel from the plate. Olek lit the yellow signal light. "We'll count to three," - he decided. - "One... two..." Then there was a gentle knock on the window: knock.... knock... knock. The children froze. Just outside the window a shadow moved - soft, round, with a long tail of glittering dust. The shadow stopped and again: knock.... knock... knock. "Lila?" - whispered Olek. - "Is it ... someone?" The Start button lit up more brightly. The star-shaped radio beeped tinily, as if to say, "Listen!". A new golden entrance, larger than all the others, shimmered in the light slide. Lila took a deep breath and reached for the lever. Olek put his finger on the button to open the window. Both their hearts beat at once like a small drum. "Three..."