I’ve been reading Andy Weir’s book “Project Hail Mary” and I’ll finish it soon and put out my review (which will be quite favorable). But while working my way through it I was impressed by how the improbability of some of the “science” in a story doesn’t spoil the enjoyment garnered by its use. After all, the premise of the story requires that Earth send an interstellar mission twelve light years away in order to move the story forward. So, the “MacGuffin” has to be accepted to go forward with the story. But what’s the formula for inventing an acceptable MacGuffin?
I suppose there are several methods. The simplest is don’t explain anything. Figure out a way for the main character to be unaware of any of the “technical” details for the MacGuffin. Maybe he’s a completely non-technical individual; a grade school dropout or a literal caveman. Or the technology is owned by an alien race that we can’t interrogate.
A more common way is to build up some technology based on a breakthrough in physics and other sciences. And because it’s fictitious the main requirements and advantages of the explanation would be that it’s self-consistent and allows some very convenient short cuts in the plot. This is the avenue Weir goes down. His MacGuffin is both the problem and the solution to the problem. He has built up a scenario that creates an existential catastrophe but also provides a mechanism for solving the problem and also turning the danger into a potential boon.
And that’s what’s extremely clever about this plot he’s invented. It mimics the idea of the double-edged sword that some new discovery can be, for example, nuclear energy. That was something that both threatened human extinction and promised the solution to the energy crisis.
As much as the mechanism Weir invents for his MacGuffin is intensely improbable, still, once accepted as fact, the rest of the story follows logically and satisfyingly from this premise. He has this new “fact” introduced into the world and then spins that world around on it until he gets the wild ride that ensues.
So now he has interstellar travel at a respectable fraction of the speed of light, a reasonable excuse for an intelligent alien first encounter and throws that together with a likable protagonist who is swept along against his will by this cosmic catastrophe. What’s not to like?
But what I realize is that I’m going to have to up my game when I write my sequel. I’ve never fleshed out the rationale behind how Connors’ mining drone is able to do what it does. I just sort of waved my hands around and said “abracadabra!” Weir is careful to count up the zeros when he describes the amount of energy that his “astrophage” is able to store and discharge as the basis of his star drive. Sure, attributing a neutrino-based energy storage system to a one-celled animal living in the hard vacuum of space in the vicinity of a star is pure nonsense. But he does acknowledge the magnitude of the nonsense. And that does make it fun.