I love SciFi so here are my top 5 around 10,000 words or less.

1) The Machine Stops - Nothing beats it

2) The Futurological Congress - Best short SciFi novel

3) The Unpleasant Profession of Jonathan Hoag - Freaking hilarious

4) Perfect Day for Bananafish - Not sci fi but amazing!

5) Blue Screen: How Peter Gustafson Defragmented the World - I wrote a short SciFi novel and my mom tells me its great :)

[1] https://www.amazon.com/Machine-Stops-M-Forster/dp/1609420667

[2] https://www.amazon.com/Futurological-Congress-Memoirs-Ijon-T...

[3] https://www.amazon.com/Unpleasant-Profession-Jonathan-Hoag-e...

[4] https://www.amazon.com/Nine-Stories-J-D-Salinger/dp/03167695...

[5] https://www.amazon.com/Blue-Screen-Peter-Gustafson-Defragmen...