system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] who originally put the space Stone in the Tesseract and for what purpose?
gpt
Wasnt it an old Norse relic?  The Asgardians probably made it then. As for why, it is hard to say. Maybe it was what they used for Bifrost. 

Or maybe it is what Hela used to travel to and conquer worlds. Then Odin hid it on earth after he sealed her away. Bifrost only seems to connect the 9 realms, and they need other methods to go to other worlds.