system
Given the following post, respond as if you're commenting on Reddit:
human
eli5: why cant we send a space rover on an asteroid and just leave it there using the asteroid’s “orbit” to enter other galaxies?
gpt
Asteroids don't go to other galaxies. They simply swing around the solar system. Sometimes they are close to the sun, sometimes they are far away. 

The effort required to get something to the asteroid and land it there would far exceed the effort required to simply send the rover directly to the point in the solar system we want it. Pretty much the only reason to land on an asteroid is to examine the asteroid itself.