system
Given the following post, respond as if you're commenting on Reddit:
human
[DC/Marvel] When superman visits other worlds to try and save them, how can the aliens and superman understand each other? Is there a universal language?
gpt
Most of the Galaxy speaks Interlac, a common language designed for trade and commerce. It's simple to learn, and thus most planets learn it as a second language for dealing with outsiders. It's like a Space Esperanto that actually works.

Superman learned it. Green Lantern Rings have an automatic translation feature. Other heroes who go to space either use Interlac, or automated translators.