First off: Link
This one is covered in awesome sauce!
I especially liked the absurdity of having the Hat Guy dropping a cat off the 45 billion light year mark.
What I was hoping was that some smart Dopers would be able to help me with the in-jokes that I’m not getting from this:
First at the same height as Discovery from 2001 there’s a streamlined space ship, with the tag, “Hey, a heaping bowl of salt!” WHAT is that from?
Then, beyond the edge of the galaxy there appears to be a cat on a keyboard. Is that from anything in particular?