When you drop an object on Earth´s surface, it falls because of gravity, and it falls at what we call 1 g. This means that it falls at one time the acceleration of Earth´s gravity. What happens when you drop an object in the International Space Station (ISS)? It turns out that it falls, but it falls sideways, and at the same speed than the station.
This causes inside the ISS a sensation of "zero gravity" (0g), or more accurately, microgravity (1x10-6 g). Don Pettit, an astronaut from the Nasa made a simple explanation of this phenomenon with an angry bird and a balloon pig. Here is the video:
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