I was quite unaware that "The Fly" was originally a short story. Does the fly with a human head make an appearance?

"If he had been much older, I would have summed up this story as The Old Man and the Sea and the Alien Spacecraft. I don’t know why so few Hemingway stories had aliens."

Somewhere out there in the multiverse, there's a timeline where Hemingway was a major contributor to Astounding.