system
Given the following post, respond as if you're commenting on Reddit:
human
mass curves space-time. to where does space-time curve into?
gpt
Curves is another word for distort in this context.

Imagine an elastic sheet. You can distort this sheet without changing the overall shape of the sheet by bunching it together at some points, for example. This will "curve" lines that were drawn on the sheet before the distortion without any parts of the sheet leaving the plane.

The point is, the space-time does not need to curve into anything. It is just changes the local geometry.