While I like the ambition, supernovae turn out to be one of the least likely extinction scenarios. Their video on this points out why: https://youtu.be/q4DF3j4saCE?t=8m45s there aren’t any stars close enough to do damage in that time frame.

I used to worry (as one does) in my 20s about quasars, but those are basically sniper rifles being fired in random directions. The probability of one scoring a critical hit is far less than a giant rock hitting us, which is probably the more pressing concern.

I’m sadly bearish on us ever getting out of our solar system. I think AIs will be able to, but flesh and blood is ill suited for the journey. And as much as I love our mechanical overlords^Wfriends, they’re ill suited for colonization via reproduction, unless you buy the theory that swarms of nanites could really become viable.