system
Given the following post, respond as if you're commenting on Reddit:
human
[WALL-E] Why was Eve equipped with a plasma cannon?

As a new settler on New-Earth, I've been viewing the records of Eve visit on Earth when she made contact with WALL-E. Eve's primary function as a robot was to scout planet Earth for Vegetation and signs of photosynthesis. So why was she fitted with a weapon so powerful such as a plasma cannon? it's clear that Earth was supposedly uninhabitable, so what on Earth (heh) could she of needed a plasma weapon for?

Followup question: How far and how long was WALL-E and Eve travelling on board the Axiom return vehicle? the vehicle did not possess a way FTL travel. (From what we're aware of) Could they have been travelling days? months? possibly years?
gpt
She'd need it in case of hostile robots or to clear debris away.

They were likely travelling only a few hours, because the plant inside was still green when she took it out. After a few days of containment, it would've been yellow or brown.