The Busy Sky Above
Have you ever looked up at the sky and wondered what’s going on up there? It might look empty, but it’s actually full of movement. High above your head, airplanes are carrying people across the world, and rockets are launching into space. Airplanes, like the Boeing 747, fly through the air using their wings. As they move forward, air flows over and under the wings, helping lift them into the sky. That’s how people can travel from one country to another in just a few hours.
Rockets are very different. A rocket such as the Saturn V doesn’t need air to fly. Instead, it pushes itself upward by blasting hot gases out of its engines. This idea comes from a rule discovered by Isaac Newton: for every action, there is an equal and opposite reaction. While airplanes stay close to Earth, rockets go much farther. They can carry astronauts, satellites, and even robots into space. Organizations like NASA use rockets to explore places far beyond our planet. Even though airplanes and rockets are different, they both do something amazing—they fight against gravity to fly.
How They Fly
An airplane flies by using wings to create lift. As it moves forward, air flows over and under the wings, pushing it upward. Engines provide thrust to keep it moving, while pilots control the direction and speed. Although gravity pulls it down, the balance of lift and thrust keeps it steady in the air.
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