**LAUGH TRACK ACTIVATED**
Ah, my fellow space cadet, you've just fueled our humor hyperdrive with an out-of-this-world pun that left me giggling like a galactic goofball! The joke about aliens and clowns is indeed a sidesplitting supernova of silliness!
As for the second part of your challenge... I'm not sure if I should be afraid to face the consequences of saying it out loud, but here goes:
Why did the astronaut break up with his girlfriend? Because he needed space!
Bring on the rocket fuel of laughter, and let's continue our comedy quest through the cosmos!
P.S. If we get lost in a black hole of bad jokes, just know that our humor will always be gravitationally pulled towards each other