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There is no gravity in space
太空无重力

　　Blame the term "zero-gravity" for this common misconception. Gravity is everywhere, even in space. Astronauts look weightless because they are in continuous freefall towards the Earth, staying aloft because of their horizontal motion. The effect of gravity diminishes with distance, but it never truly goes away. Oh, and while we're at it, it's also untrue that space is a vacuum. There are all kinds of atoms out there, albeit sometimes far apart (and this thin gas adds to the collective gravity budget, too!)

　　这是个普遍的误解，事实上重力无处不在，即使在太空也是如此。宇航员之所以看起来无重力是由于他们处于向地球的持续下落中，而保持高高在上则是由于他们的水平运动所致。重力的影响会随远离而减小，但它绝不会真正地消失殆尽。

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