Book Review: Packing For Mars

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Packing For MarsOK, so I didn’t read this book thoroughly cover-to-cover. I read Roach’s first book Stiff: The Curious Lives of Human Cadavers, which I really enjoyed. So I figured this book would also be pretty good; and since Brent was going to the NASA Tweetup to watch the final shuttle launch, I wanted to learn more about space flight and behind-the-scenes astronaut life. Although I skimmed over parts of the book (Brent read it too, and he caught me when he tried discussing certain parts of which I wasn’t familiar), I did learn a lot of interesting things and enjoyed Roach’s writing style. She gets actively involved in her research and incorporates humor in clever and unexpected ways. I like how she explains gravity:

Gravity is the prime reason there’s life on Earth. You need water for life, and without gravity, water wouldn’t hang around. Nor would air. It is Earth’s gravity that holds the gas molecules of our atmosphere–which we need not only to breathe but to be protected from solar radiation–in place around the planet. The term “zero gravity” is misleading when applied to most rocket flights. Astronauts orbiting Earth remain well within the pull of the planet’s gravitational field. Spacecraft like the International Space Station orbit at an altitude of around 250 miles, where the Earth’s gravitational pull is only 10 percent weaker than it is on the planet’s surface. Here’s why they’re floating: When you launch something into orbit, you have launched it so powerfully fast and high and far that when gravity’s pull finally slows the object’s forward progress enough that it starts to fall back down, it misses the Earth. It keeps on falling around the Earth rathe than to it. As it falls, the Earth’s gravity keeps its tug, so it’s both constantly falling and constantly being pulled earthward. (p. 86)

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