Alexander Friedmann

Alexander Friedmann was a super-duper smart scientist and math whiz from a long time ago. He lived in Russia, and even though he was a real person, he thought about giant, amazing things like the whole universe! He used his amazing brain to come up with ideas that changed how we think about everything around us, from the tiniest speck to the biggest star.

Alexander had a mind-blowing idea: what if the universe isn't staying the same size? What if it's actually stretching and getting bigger, like a balloon being blown up? He wrote down special math rules, called the Friedmann equations, to explain how this could happen. It was like he found a secret code for how the universe works!

Before Alexander, many people thought the universe was just… there, and always the same. But his idea showed that the universe is dynamic and changing! It's like discovering that your favorite toy car can actually grow bigger over time. This helped other scientists understand that the universe has a story and is always on the move.

Alexander used really tricky math to figure out his amazing ideas. His special equations, the Friedmann equations, are like a recipe for how the universe expands. They help scientists understand how fast things are moving apart and what the universe might have been like a long, long time ago, and what it might be like in the future.