system
Given the following post, respond as if you're commenting on Reddit:
human
[Superman]How come Superman’s biological parents never go with him to Earth if Krypton is advanced enough to build spaceships?
gpt
Krypton doesn't have starships. Jor-El made Kal's pod in secret when it became apparent he wouldn't win over the Science Council; his original plan was to make one big enough for Lara to join Kal, but when she pressed him he admitted it would reduce the likelihood of Kal's survival. So she refused.