Arthur Eddington was an incredibly smart person who lived a long time ago. He was born in 1882 and passed away in 1944. He was a scientist who studied the Universe and how it works.
One of the things that Arthur Eddington is known for is his work on black holes. Black holes are like giant vacuum cleaners in space. They suck in anything that gets too close, even light, which is why they are called "black" holes. Eddington helped us to understand how they worked and how they affected the things around them.
Eddington also studied something called "general relativity" which is a way of understanding how gravity works. He showed how Einstein's theory of relativity was correct and helped to explain some of the strange things that happen in the Universe.
Another thing that Eddington is famous for is his work on stars. He figured out how stars work and how they are made up. This helped us to understand the Sun and how important it is to life on Earth.
Eddington was one of the most important scientists of his time, and his work has helped us to understand the Universe in ways that we could have never imagined. We still use his ideas today to learn more about space and the things that live in it.