They do the same thing. Forerunner slipspace can tear a hole in reality but not something like the UNSC engine which shortens the physical distance. It takes months to cross across the galaxy with a slipspace engine yet it takes hyperspace only a few days. The Rakatans created hyperspace feuled on a planet's force potential. A missile able to go as fast as to bend reality with hyperspace would go strait through a ship in slipspace.
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[i]UNSC Slipspace is laughably inferior to Forerunner Slipspace. A Forerunner Keyship, operating at 10% engine efficiency, was able to travel at 98.8 light-years per hour. At full power, that same ship can travel 988 light-years per hour, or 23,712 light-years in a single day. Clearly much faster than anything in Star Wars. Nothing from Star Wars can enter Slipspace because [u]Slipspace does not exist in Star Wars.[/u] Period. If you're making claims that the Rakata can somehow launch a missle into Slipspace, a realm they do [u]not[/u] know about, you'd better be able to prove it. [/i]