Answer:
What is an astronaut’s favorite key on a keyboard?
I'm light as a feather yet the strongest person can't hold me for more than a few minutes. What am I?
I make things short but I am pretty long myself
I have cities with no people, forests with no trees, and oceans with no water. What am I?
Curtail me thrice I am a youth; behead me once a snake; complete I'm often used in truth when certain steps you'd take.
I flow from the Homer’s mouth when he sees doughnuts.