The Dark Energy Survey is a big project where a lot of smart people take pictures of the night sky to try and understand what's happening in the universe. They want to learn more about something called "dark energy", which is a mysterious force that makes everything in the universe move away from each other faster and faster.
To take these pictures, the scientists use a very big camera called the Dark Energy Camera. It's like a really big eye that can see very far away things in space. They take these pictures using really advanced technology called "digital imaging", which means they take a bunch of pictures and then put them together to make one big picture.
The scientists look at these pictures and try to understand what they mean. They look for patterns in the way that things are moving and how they are arranged in space. They want to figure out why the universe is expanding faster and faster and what might be causing it to happen.
It's a really difficult project, but the scientists are very smart and are working hard to try and learn as much as they can. By understanding more about dark energy, they hope to learn more about the universe and our place in it.