Air is above us, and so is space. So, is there air in space?
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The space is a vacuum – a near-perfect one with nearly zero pressure. That means there’s no air there, as we know it. There are some particles, but it’s not enough or too far apart to call it air.
Why there’s no air in space has the same reason as to why we have a hard time breathing in higher altitudes – gravity. The air (or atmosphere) is pulled by gravity toward the Earth’s surface, causing atmospheric pressure. Oxygen, especially, gets pulled and concentrated in the lower areas of the atmosphere, so the higher the altitude, the less oxygen there is.
In outer space, the Earth’s gravity no longer has an effect, so the air molecules just basically fly away that there’s barely anything at all.