Why did the astronaut break up with his girlfriend? He needed space.
Because he was a star-struck teenager.
Why did the alien go to the bar? To get a little "galactic."
Why did the spaceship break up with his girlfriend? It was a "black hole" in their relationship.
What did the astronaut say to his wife when he got home from the moon? "Honey, I'm home!"
Why did the alien go to the doctor? He had a "space case."
Why did the astronaut get fired from his job? He was "lost in space."