One of the major science fiction themes that are in Dark They Were, and Golden Eyed is the extrapolation when Harry Bittering first finds the tainted food and then the yellow eyes of the people. "'You know they have! Onions but not onions, carrots but not carrots. Taste: the same but different. Smell: not like it used to be'" (Bradbury 134). Then the part of the yellow eyes, "'Sam, you shouldn't have yellow eyes'" (Bradbury 136). From this it can be extrapolated from the change of the food to the change of the people that everybody will start turning into the aliens that lived there.
Another science fiction is the whole part of the human beings of Earth exploring and finding a civilization of Mars. "'We don't belong here. We're Earth people. This is Mars. It was meant for Martians. For heaven's sake, Cora, let's buy tickets for home!" (Bradbury 131). The human race had explored Mars and these people began living here and exploring the different places of it. Thus, making it the exploration theme of science fiction novels.
Science fiction also has the theme of catastrophes, for when Mr. Bittering finds out from his daughter that the Earth is having a nuclear war. "'Mother, Father-the war, Earth!' she sobbed. A radio flash just came. Atom bombs hit New York! All the space rockets blown up. No more rockets to Mars, ever!'" (Bradbury 132). At this part in the novel the Bitterings find out that the Earth is under attack and the great catastrophe of a nuclear war has begun to take place.
One other big science fiction trait is that there is the technology in the novel by there being the ability of people living on Mars and the ability to get there by a rocket. So far there is no technology yet that allows us to live on such a planet, but the people in the novel somehow find a way to breathe and grow food on there. The other technology is in there being a rocket to Mars. Again another thing that is not...