In one sentence, describe what the following article is about:

Most alien sci-fi stories take place in either the world of aliens or in the world of humans. There may be some flashbacks that provide detail about either world, but most stories stick to one setting. You may want to decide right away if your story is going to take place in alien world or human world. You may include details of either world in the story's setting. For example, if your story is set the alien world, humans in the alien world may still remember their own customs and rituals. This would then allow you to show the reader the contrast between the alien customs and the human customs. You may also decide to have aliens who invade the human world, integrating their customs into the customs of the humans. The aliens may also bring their own rituals and try to impose them on humans. Start by outlining the basic details of the alien world, including the biology of their world and the basic infrastructure of their world. Consider several questions when building the physical world of the aliens: Is their world green, lush, and full of other species besides the aliens? Or is it foggy, cold, and dark? Maybe their planet contains multiple eco-systems or only one eco-system that is ideal for the alien race. Perhaps they subsist of a specific crop that only grows in certain areas of their planet. How do the aliens move around in their world? Do they fly in spaceships or have special clothing that allows them to jump and fly? You should also consider basic infrastructure elements like housing, food sources, energy storage and distribution, waste disposal, and the layout of the towns, cities, or neighborhoods in the alien world. Just like humans, the alien race will have their own historical events, such as times of war and times of prosperity. You should write down a history of the alien world to give the aliens some backstory. Consider several questions, such as: Did the aliens crash land on their planet and build it into a thriving metropolis? What were the major events of their history? For example, maybe their world is no longer inhabitable due to a natural disaster or genocide. Or maybe their world is prosperous and the envy of other planets in the galaxy. You should also think about different races within the alien world, such as aliens who are considered royalty or higher born and aliens who are considered servants or slaves. You should try to have a diverse range of social classes and backgrounds in the alien world, as this will make the aliens more distinct and varied. You should also consider the daily life of the aliens. This could include the rituals and customs of the alien world, from how the aliens wake up in the morning to how they worship their god or belief system. Going into these details will help you create a backstory for the aliens and make them seem more believable. You should determine the psychology among the alien world and consider how the rituals and customs in the alien world affects their beliefs and values. Maybe the aliens do not believe in eating other living beings and this means they do not raise animals or beings besides themselves on their planet. Or, maybe the aliens are a matriarchy, where females are in power. This could then affect their attitudes toward male aliens in the alien world. You may also consider how the aliens procreate, as the sexual lives of the species could be an important factor in their interactions with the human world in your story. Your story may involve the world of humans as well as the world of aliens. Because you are writing an alien sci-fi story, the focus may be more on the alien world than the human world. But describing the human perspective can still be useful for building backstory. You should outline the physical world of the humans in your story as well as the history of the human world. Consider if the human world is suffering due to a disease, a plague, a natural disaster, or a man made disaster, such as nuclear war or civil war. Maybe a planet very similar to Earth has been destroyed and become uninhabitable, forcing humans to look at alien worlds to conquer and re settle. You should also consider the rituals and customs of the human world. Does the human world resemble our current world or does it focus on a specific area of the world? How do the humans use rituals and customs in their daily life? How does the human world differ from our current reality?
Decide if the story is going to take place in the world of aliens or of humans. Build the physical world of the aliens. Create a history of the alien world. Outline the rituals and customs of the alien world. Determine the characteristics of the human world.