system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Why did the current Enterprise triple in size compared to Enterprise Prime?

Did Nero's appearance in the *Narada* cause Starfleet to bulk up their ships in size, armor and weaponry?  
  
Or am I seriously misunderstanding the size of the current Enterprise?
gpt
When Nero showed up and attacked Kirk's ship, it created a sort of worry in Starfleet regarding unknown aggressors with vastly superior technology. It's not dissimilar to what happened to Starfleet in the unaltered timeline when they encountered the Borg. Ships became more militarized and weaponized. The same happened with the Dominion war. Nero's temporal incursion merely started this process sooner so that the new Constitution class ships of this altered timeline are humongous and generally more ready for a military role than a scientific one.