Why was Stephen Hawking late to the NASA meeting?
He couldn't get up the kerb.
I like Uranus.
What do you call a black hole?
Butt hole.
I invented a time-traveling machine and traveled back to Pangea. I warned the dinosaurs about the deadly asteroid. They told me, "It wasn't an asteroid... it was Pionel Pessi's penalty ball ricocheted from Mars that made them extinct." Tears ran down my face. Shame on you, Pessi!
Your hairline is so big, not even a black hole can eat it!
What do your underwear and the Starship Enterprise have in common?
They are both concerned about “Klingons near your anus”.