World Engines by Stephen Baxter

Destroyer

Set in a future where humanity has colonized the solar system, the narrative follows astronaut Reid Malenfant, who is unexpectedly awakened from cryogenic sleep to find himself in a drastically altered world. As he navigates this new reality, he discovers that Earth is on the brink of an existential crisis, with the planet's fate intertwined with mysterious alien artifacts and the enigmatic "World Engines." Malenfant must unravel the secrets of these powerful machines to save humanity, embarking on a journey that challenges his understanding of time, space, and the very nature of existence.

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