It isn't currently known whether there is even a single species outside Earth - sentient or otherwise. The number you mention has been made up by somebody.
You can make 100 billion separate books that has the descriptions of about 10,000 trillion sentient species (100,000 per book) by simply orderly compiling them.
There's a 1 1/2 page detailed description for each sentient species, their histories, what planet and moon they're from, and what native language they speak. And there's 20 million of them in the Star Wars galaxy. So there's 30 million pages in the in-universe reference book.
Fiction authors have a free hand for what is in their books. However it is not known how many sentient species there are so the author may decide that also.
No. There won't be a Star Wars reference book that has all the info and descriptions of 20 million sentient species (because, in addition to the large sentient species portraits, each 1 1/2 page will give a detailed description of the sentient species of every shape, size, color, unusual feature, their histories, and what planet and moon they're from, and it will be 30 million pages in length).
Yes. There are at least 12,600 trillion intelligent civilizations (i.e. sentient species) in the observable universe (126,000 per galaxy). They come in all shapes, sizes, colors, unusual features, etc. There is also at least 100 billion in-universe reference books of them (excluding non-sentient ones), because in addition to their large portraits, they get a 1 1/2 page detailed description of their species, their histories and what planet and/or moon they're from, which is at least 189,000 pages in length per book. But for now, it is unknown.
Not even a single alien race has been found so far. However, assuming for the sake of argument that there are, indeed, 10,000 trillion sentient species (100,000 per book), you would first have to gather all the information (where from?), then store it in some computer system. Both seem impossible tasks, at least for the time being.
No. The authors, including Daniel Wallace, can't make a Star Wars reference book that has all the info and descriptions of 20 million sentient species in the galaxy, because it will be at least 30 million pages in length (1 1/2 pages for each of their large portraits, their species, their histories and what planet and/or moon they're from).
The Star Wars galaxy is FICTIONAL, as would be any such reference book.
No. There won't be a time they will make a Star Wars reference book (similar to The Essential Guide to Alien Species reference book published in 2001) that will contain all the info and descriptions of the 20 million sentient species (excluding non-sentient and extra-galactic ones) in the galaxy of every shape, size, color, and unusual feature because it will be at least 30 million pages in length (In addition to the large alien portraits, they get a 1 1/2 page detailed description of the species, their histories, what planet or moon they're from, and what books or movies they're in). Due to the 30 million pages in length, it will be in 12,000 separate reference books (2,500 pages in length per book).
Yes. The Star Wars galaxy does have 20 million sentient species. They come in all shapes, sizes, colors, unusual features, etc. There is also a reference book of them (excluding non-sentient and extragalactic ones), because in addition to their large portraits, they get a 1 1/2 page detailed description of their species, their histories and what planet and/or moon they're from, which is at least 30 million pages in length in the book.
Yes. There are 20 million species of intelligent life in the Star Wars galaxy. They come in all shapes, sizes, colors, unusual features, etc. There is also an in-universe reference book of it (excluding extra-galactic and non-sentient ones), because in addition to their large portraits, they get a 1 1/2 page detailed description of their species, their histories, what planet and/or moon they're from, and what books or movies they're in, which is at least 30 million pages in length .
The Last Book in the Universe was created in 2000.