Ask an Astronaut: What surprised you most in space?

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  • Astronaut Garrett Reisman took in countless indescribably beautiful views while he lived in space. But most shocking, he says, was observing the thinness of Earth’s atmosphere.
  • You can compare the thickness of the atmosphere to the diameter of Earth to the skin on an apple, or the shell of an egg. It’s incredibly thin and shows just how seemingly fragile our planet is.
  • But to put this into perspective, whereas the atmosphere reaches a height of 300,000 feet from Earth’s surface, the deepest part of the ocean only reaches 35,000 feet, ten times thinner than Earth’s atmosphere. Everything we experience on Earth, from sea to sky, exists on just a tiny slice of precious surface coating.

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