system
Given the following post, respond as if you're commenting on Reddit:
human
[superman] Were the kryptonians aware of their power before superman went to earth?

kryptonians were far more advanced than humans currently are. So, were they aware of their physiological reactions to the yellow sun? I was wondering if they could have simulated a room that would give them a massive dose of yellow sun radiation. Then, they could put on a space suit, and walk around their planet as a god and recharge as necessary. Maybe not as powerful as superman, but there could have been millions of super powered people. Im, not sure what destroyed their planet but maybe this could have prevented it.

*edit: I added italics here: I remember watching an episode of Justice League where some woman makes a room of red sun radiation and it drains superman of his powers. Could the opposite have been created on krypton?*
gpt
In the movie universes, Jor-El at least definitely knew. In MoS its implied that is why he chose Earth as the destination in the first place. 

In the comic universe its slightly less clear. Sending Kal-El away is often shown as a last ditch, spur of the moment decision to save their son rather than being premeditated and planned, as his landing on Earth is often written as being a chance happening.