LUMINESCENT ALIENS (MONSTERS 2010)
Moon of Jupiter
They’re aliens from Europa, a moon of Jupiter, which has a thin oxygen atmosphere and possibly an ocean under its surface. It’s one of the prime candidates for life elsewhere in the solar system, and if it’s hard to understand how that life might be 50-foot-high spiders that float and have a pulsing inner glow.
The story, set some years in the future, explains that a probe was sent to Europa to search for life. On its return, it crash-landed in Mexico. Whatever was on board found the conditions here suitable. The Beings have occupied a wide swath of northern Mexico, known as the Infected Zone, and travel through it is forbidden. The two nations are connected only by boats and airplanes. A massive wall has been constructed to keep the creatures out of the United States, and Air Force planes fire missiles at them.