system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do they shoot space movies to look like zero gravity?

I'm talking older movies, too, like 2001 a Space Odyssey when superior editing technology was still a ways off.
gpt
In the case of 2001 it was actually really clever: They suspended the actors on wires just like a lot of movies used to do, but they built the set sideways and put the camera on the ground pointing upwards. 

This accomplished two things: First, the actor's body hid the wires so you didn't have to try to remove them in post. Second, the actor's movements drifting horizontally (which, from the camera's perspective, appeared to be vertical) looked WAY more natural than having a stagehand jerk the wires up and down.