There was a book a long time ago that I once read. It was beautiful, but what I remember most was a description of a fictional alien race of this giant mind that was made of solar systems or dark space clouds. There was another race that looked like jellyfish and it said most are doctors, in some science fiction book.

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    Hi, welcome to the site. In roughly which year did you read this, and when do you think it might've been published? Also, do you recall any details about the cover? Mar 26, 2022 at 18:51
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    Did this book have any illustrations? Was it paperback or hard cover?
    – DavidW
    Mar 26, 2022 at 19:02

2 Answers 2


Possibly Barlowe's Guide to Extraterrestrials which is readable and downloadable at the link.

The book contains images of different alien races from dozens of various science fiction books.

Included in this is the alien Black Cloud from Fred Hoyle's story The Black Cloud. The Cloud is an intelligent interstellar hydrogen cloud 150 million kilometers in diameter.

However it was not a jellyfish like race that were doctors but Cinnrusskins who are an insectoid race from the books Hospital Station and Star Surgeon by James White.


Sounds like Barlowe's Guide to Extraterrestials - Which includes both the Medusa, a gas giant dwelling Jellyfish critter and Solaris, a ocean-like world mind, and the Black clouds, intelligent space clouds.

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