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Project hail mary andy weir12/26/2023 ![]() ![]() It would be 29 times the Hail Mary’s internal pressure of one third of an atmosphere-in other words, 9.67 atmospheres. First off, the surface pressure on Erid would not be 29 atmospheres. This is why the Eridians are blind to visible light and instead can see nearly as well as we can with echolocation.īut this is wrong. This dense atmosphere absorbs almost all of the sunlight hitting the planet, making the surface pitch black. Ryland Grace’s new friend, Rocky, is a spider-like alien from the planet Erid, in the 40 Eridani system (technically 40 Eridani A, since it’s a triple star system).Įrid’s atmosphere is much denser than Earth’s and is made of almost pure ammonia (which makes little sense at that temperature, but there are a lot of acknowledged-in-story “impossibilities” in the book my complaint is not with those). If you have read the book, you’ll know that there are aliens involved, and I don’t just mean the Astrophage. ![]() Do not click unless you’ve read all the way to the end. Warning: MAJOR spoilers for Project Hail Mary below. Neither one is completely story-breaking, but they do add complications-one of them glaringly obvious (to me as an exoplanetary scientist), the other one much subtler. However, there were two aspects of the science in the book that did include rather large mistakes. ![]() However, those things could just be there so that the book doesn’t get too far ahead of the reader. Those aren’t really wrong, but I would say they felt unrealistic. I had a few minor quibbles with the book that were mostly focused around how slow the scientists are to figure things out. Weir always does mostly pretty good science in his books, but sadly, no author is perfect, especially as Weir is a computer engineer by trade and not an astrophysicist. Andy Weir’s latest book, Project Hail Mary, is a very good hard science fiction tale about a journey to another solar system in search of a way to save Earth from disaster. ![]()
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