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I am trying to find a story I read a few years back. It was a space opera-type story with big military spaceships, discovering remains of a past civilization in the form of big asteroid-like supercomputers telling about their death.

At some point in the story "bubbles" form on the ship, allowing soldiers to travel through the fourth dimension.

I hope I am not mixing up things and would be really happy if someone recognized this.

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  • Hi, welcome to SF&F. Approximately when was "a few years ago?" Was it a short story or a novel? Check out the other suggestions to see if they help you recall any more details you can edit into your question. – DavidW Oct 5 '20 at 0:22
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This sounds a bit like brief parts of the 2010 Death's End by Cixin Liu (first published in English in 2016), the third book of the Remembrance of Earth's Past trilogy.

In a forshadowing scene in the book, members of a small interstellar excursion—really exiles fleeing the Earth/Trisolaran military conflict that forms the main dramatic tension of the story—stumble into a 'region' of space providing access to 4 spatial dimensions. While carefully exploring this zone, the humans encounter multidimensional artifact of some degree of artificial intelligence. Just as you describe, this AI is a monument to the former 4D civilizations that built it.

Below is the US English language cover.

Death's End cover

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