There are plenty of threats out there that could terminate all life on our little planet in varying amounts of time. (Solar flares, meteors and supernovas to name a few).
Are there any disasters that could kill all (intelligent) life on Earth but leave astronauts in low orbit alive for long enou...
My initial impression is that it's too opinion-based, because the kind of computer which could actually simulate our reality is so far beyond our current understanding that we'd have to speculate about its nature.
The Factory Floor
The Factory Floor