The Astro City mythos includes an abundance of Alien life forms, species and civilizations. Very little is know about most of them. Their interactions are just minor background elements --for example-- the Universals. A few are beneficial and helpful allies like Starwoman. Others are extremely dangerous, threatening Earth's very existence. One of the most terrifying were the Enelsians. Over the years, Astro City and its denizens have been exposed to lots of Aliens. The Herocopia Project has cataloged a few of them. There are others to research and discuss.
