Scientists.
[spoiler]you'd be the ultimate guinea pig.
They'd "kill" you over and over again to see what you could survive [/spoiler]
Edit : 1
Family seems to be the prime reason for alot of people here
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I get freaked out at the fact that if I lived so long that the Earth was destroyed or the Sun blew up, I would be drifting in Space for an inconceivable amount of time.