"If I told you that I love you more than any man has ever loved any woman would you marry me?"
"If I promised to care for you until my dying breath, giving everything you could ever need, would you marry me then?"
"If built a rocket, flew it to the moon, tunnelled to its core and filled it with enough dynamite to blow that wretched orb to Kingdom Come, would you marry me then?"
"If you did that? Yes. I probably would"
I feel kind of bad. He didn't know the first thing about space travel. Even if he'd managed to come back alive, I doubt I would have married him anyway.