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Imagine you’re an astronaut. Imagine you’re on a spacewalk. Imagine, in other words, that you are whirling above the Earth at more than 17,000 miles an hour, the only thing between you and the deadly vacuum of space a padded suit, a hardened helmet, and an umbilical tether that you hope is really, really strong.
Now imagine that your helmet, suddenly, starts filling with liquid.
Read more. [Image: NASA]