Okay kiddo, so there were these astronauts called the Apollo 8 crew who went to space a long time ago. When they were up there, they took a special picture of the Earth called a "Genesis" reading. This picture showed the Earth from far away, and made people think about how big and amazing the universe is.
But, the name "Genesis" also has another meaning. It's the name of a story in the Bible about how the world was created. When the Apollo 8 crew read from the Bible while they were in space, they read the story of Genesis to people back on Earth. This was really special because it was the first time people read from the Bible in space, and it made a lot of people think about the connections between space and religion.
So, the Apollo 8 Genesis reading was kind of like a special moment in history that helped people appreciate the beauty and mystery of the universe, while also thinking about the important beliefs and stories that people have about where we all came from.