What is dark they were and golden eyed?

"Dark They Were and Golden-Eyed" is a science fiction short story written by Ray Bradbury. It was first published in Thrilling Wonder Stories in August 1949 and later included in Bradbury's short story collection "The Martian Chronicles."

The story follows a group of humans who have relocated to Mars to escape the destruction of Earth. As they begin to settle into their new home, they start to notice strange changes in their surroundings and in themselves. The protagonist, Harry Bittering, becomes particularly obsessed with the idea that Mars is changing them into alien beings.

The title of the story refers to the transformation of the humans as they adapt to their new environment. The darkening of their skin and the golden color of their eyes symbolize the ways in which they are becoming more like the native Martians.

The story explores themes of identity, alienation, and the fear of the unknown. It has been praised for its evocative language and thought-provoking ideas about the effects of colonization and adaptation to new environments.