Project Hail Mary is the 3rd book written by Andy Weir, who is also the author of The Martian.
This book is told in the first-person perspective of Ryland Grace, a biologist who gave up on his dreams and became a middle school science teacher. The conflict starts when scientists on Earth start to notice that the sun is being drained of its energy, and calculate that the Earth will experience a new ice age in 30 years. Ryland Grace is called upon to go on a long suicide mission to find the solution and save humanity. Spoilers ahead.
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