This question was not clearly answered in the novel Interstellar, but it could be guessed through some clues and explanations in the novel. One possible explanation was that when the male protagonist entered the black hole, he was pulled by the gravity of the black hole, causing space-time distortion and entering the space-time of the male protagonist's childhood. Since the male protagonist's childhood was in a library with a lot of bookshelves, he might find himself back behind his own bookshelves. This explanation still needed to be combined with some plot and details in the novel to be established. Another possible explanation was that when the male protagonist entered the black hole, his body was swallowed by the black hole, but at the same time, he also entered an unknown space or dimension. This space or dimension had some connection with the male protagonist's childhood. In this unknown space or dimension, the male protagonist might find himself back behind his bookshelf. It should be noted that these explanations are only some clues and explanations in the novel, and they may not be the accurate answers. The real answer might need to be analyzed with more scientific knowledge and historical background.
The interstellar transmigrator male lead entered the black hole because he and the heroine passed through the wormhole to save mankind, but they encountered a huge gravitational force and eventually entered the black hole. In the black hole, time and space are distorted, and the male protagonist enters a completely unfamiliar realm. He finds himself in a brand new world, which is full of mystery and danger. In this world, the male protagonist experienced many strange events and experiences, and he gradually discovered the connection between this world and the universe he was in. In the end, the male protagonist left the black hole and returned to the universe, but he left some strange marks and signals that were eventually discovered by humans. These marks and signals indicate that the world the male protagonist lives in is different from the universe we are familiar with. The male protagonist's experience in the black hole may also have an impact on the universe we know.
The specific reason for the books on the shelves of Interstellar Travel could only be known by the author himself or the copyright owner. However, generally speaking, these books might include novels, history, philosophy, science, and many other fields of content that might be related to the plot and theme of Interstellar. For example, some scientific concepts and theories in Interstellar Crossing, such as gravitational waves and black holes, might need to refer to some physics and astronomy books. Some of the scenes and character settings in the novel might also need to refer to some books on philosophy and psychology. Other related books may also be specially purchased by the author to support his work. For example, the author may refer to some historical events and characters and describe them in the book. At this time, he would need to refer to relevant historical books. In short, only the author himself or the copyright owner would know the specific reason.
There was no definite answer to this question because interstellar travel was a fictional novel. The plot and setting were all fictional. In the novel, the fifth dimension of Earth was set behind the bookshelf in his house, probably because this setting could provide more imagination and plot development for the story. For example, he could store some books about the fifth dimension on the bookshelf at home. Through these books, he could show the concept of the fifth dimension and let the protagonist explore the fifth dimension to find a way to return to Earth. Of course, these settings were all fictional and did not exist in real life. If one wanted to know more about the Earth's fifth dimension, one might need to read up on relevant scientific knowledge or study the plot and setting of science fiction.
In " Interstellar Crossing," this beautiful and deadly black hole was called the " Möbius Belt Black Hole." The Möbius Belt black hole is a celestial body with a very small event horizon, but its gravitational field is very strong enough to devour anything that approaches it. The shape of a Mobius belt black hole is similar to a black hole with a curved path. Its gravitational field bends along the path so that objects close to it cannot escape its gravitational range.
There was no clear answer to this question in the hedgehog cat's novel. In the novel, whenever a character enters a small dark room, their books are usually permanently locked on the bookshelf. Therefore, if the character comes out again, whether their books will still be on the bookshelf depends on how they leave the small dark room. Some plots might leave the book on the shelf, such as a character performing some mysterious ritual in a dark room or reading for a long time. This might cause the book to be permanently locked on the shelf. Other plots might cause the book to be lost or stolen by other characters, so whether it was still on the shelf depended on the development of the plot.
In Interstellar, the fatal black hole that the male protagonist fell into was called the Aiken Black Hole.
It could be related to some unknown cosmic forces or a fantasy element. Maybe it holds secrets of a different dimension.