Understanding Loud Extraterrestrial Civilizations: Grabby Aliens

Imagine that we're living in a universe where there might be other intelligent alien civilizations out there. These aliens could be either "loud" or "quiet." Loud aliens are really noticeable because they expand quickly, stick around for a long time, and make big changes to their environments.

In this particular study, the researchers came up with a model for loud aliens that they called "grabby".