I have recently found my copy of Hawkings' A Brief History of Time which I have never finished. This time I'm determined to read it all the way through. However, the book is now almost 25 years old. Is the book still relevant, or has any recent discoveries invalidated parts of it?
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The book was published in 1988. Flipping through it now, I don't notice anything that has actually turned out to be wrong. It predates the modern era of high-precision cosmology and the discovery of the acceleration of cosmological expansion. The chapter on string theory dates from the era when string theory wasn't yet looking like a failed research program.