“How many stars are in the sky?”/“All of them.”

An astronomy riddle is:
     
Q: How many stars are in the sky?
A: All of them.

     
The riddle was printed in the “Ask Marilyn” column by Marilyn Mach Vos Savant in Parade Magazine on March 22, 1987. “How many stars are in the sky? All of them” was posted on Reddit—Cleanjokes on May 22, 2021.
   
Similar riddles include “How many apples grow on a tree?”/“All of them” (cited in print since at least 1976), “How many cranberries grow on a bush?”/“All of them” (cited in print since at least 2008) and “How many bones are in a human body?”/“Usually, all of them” (cited in print since at least 2016).
     
 
Newspapers.com
22 March 1987, The Sunday Advocate (Newark, OH), “Ask Marilyn” by Marilyn Mach Vos Savant, Parade Magazine, pg. 9, col. 1:
“How many stars are in the sky?”
Andrew Cross, Jonesboro, Tenn.
All of them. (I apologize, but I couldn’t resists.) Actually, the most you can see with the naked eye is about 5000, but the astronomer Carl Sagan says there are 10 billion trillion stars.
           
Twitter
Doug Walker (δοῦλος)
@dougwalk
OH: How many stars are in the sky? ....uhhh, all of them?
2:54 PM · Jul 4, 2010·Twitter SMS
   
Twitter
Britney Nicole
@_BetaZeta
Question:  How many stars are in the sky?
Answer:  ALL of them 😊....
- Scott Phillips
Soooooo, go be GREAT!!!... http://fb.me/1tSGrpjrZ
9:26 AM · Jun 3, 2014·Facebook
   
Twitter
Mr. Moore
@Piano_Shop
Replying to @SciencePorn
@SciencePorn Q. How many stars are in the sky?
A. All of them.
11:20 AM · Dec 20, 2014·Twitter Web Client
 
Twitter
Aly
@Faeriina
How many stars are in the sky? — all of them. https://curiouscat.me/AaaaILikeCats/post/105110324?t=1487375322
6:48 PM · Feb 17, 2017·Curious Cat
 
Star in a Star
SEPTEMBER 24, 2018 BY DANIEL CUMMINGS
How many stars are in the sky? A Quiz
(...)
Another trick answer to “how many stars are in the sky?” is: “all of them!” All of them are in the sky, but they are just not visible to you “right now” for one reason or another.
 
Reddit—Jokes
Posted by u/Skillet_Wizard December 24, 2018
I asked my dad
I asked my father the other day “How many stars are in the sky?” “All of them.”
   
Twitter
Tom Easton
@TomEaston
Replying to @TomEaston
Caveteen: Cavedad, how many stars in sky?
Cavedad: All of them. Hahahahaha!
Caveteen: *sighs heavily*
#cavedadjokes
2:17 AM · Mar 6, 2019·Twitter for iPhone
 
Reddit—Cleanjokes
Posted by u/DriveOff May 22, 2021
How many stars are in the sky?
All of them.