Secondary source

Have you ever dropped your favorite toy and watched it fall right to the floor? Or thrown a ball high into the air, only for it to come right back to you? That’s me! I’m the invisible force that gives the world a constant, gentle hug. I keep your feet on the ground when you jump, and I make sure your warm blanket stays on top of you at night. Before people knew my name, they just knew that things always fell down, never up. They wondered what secret power was at work, pulling everything toward the center of the Earth. You can’t see me or touch me, but I’m one of the strongest and most important things in the whole universe. My name is Gravity, and I’m so happy to meet you.

For thousands of years, people felt my pull but didn't have a name for me. It was just the way things were. But then, a very curious man came along. His name was Isaac Newton, and he loved asking questions. One day, around the year 1666, he was sitting under a tree when he saw an apple fall to the ground. Plop! He started to wonder, 'Why did the apple fall straight down? Why not sideways, or even up into the sky?' He thought about it for a very long time. Then he had a super-sized idea. He looked up at the big, beautiful Moon in the sky and thought, 'What if the same secret pull that made the apple fall is also what keeps the Moon from floating away from the Earth?' He was right! That was me, Gravity, doing both jobs. He realized I wasn’t just on Earth; I was everywhere in the universe, holding planets and stars in a giant, cosmic dance. He wrote all about me in a special book on July 5th, 1687, so everyone could understand my secret.

Today, knowing about me helps people do amazing things. It helps them build tall skyscrapers that don't fall over and airplanes that can safely fly through the sky and land again. When you see astronauts floating in space, it’s because they are so far from Earth that my hug is much lighter. But I’m still there, keeping their spaceship in orbit! I am the reason we have a Sun to warm us and a Moon to light up the night. I am a steady, dependable friend who keeps our world in order. So next time you drop a spoon or jump up and down, give a little wave to me, Gravity! I’ll always be here to pull you back into a safe, gentle hug and keep you grounded, so you can keep reaching for the stars.