Hello, I'm an expert in astrophysics with a focus on the effects of space environments on human physiology. Let's dive into the question at hand.

If you were to take your mask off in space, several things would happen almost instantaneously due to the unique conditions of space. Here's a step-by-step breakdown:


1. Evacuation of Oxygen: The oxygen in your lungs would rapidly evaporate into the vacuum of space, causing you to lose consciousness within seconds.


2. Expansion of Gases: The gases in your body would expand due to the lack of pressure. This could cause your body to swell, but contrary to popular belief, you would not explode.


3. Boiling of Body Fluids: Your body fluids would start to boil almost immediately because there is no atmosphere to provide pressure. However, the lack of convection in space would prevent rapid boiling, so it would be a slow process.


4. Radiation Exposure: Without protection, your body would be exposed to radiation from the sun and cosmic rays, which could cause severe damage to your cells and DNA.


5. Temperature Extremes: You would experience extreme temperature variations; the side of your body facing the sun could heat up to 200 degrees Fahrenheit (93 degrees Celsius), while the side away from the sun could plummet to -250 degrees Fahrenheit (-157 degrees Celsius).


6. Decompression Sickness: The rapid change in pressure could cause decompression sickness, similar to the bends that divers experience.

7.
Space Debris: You would be vulnerable to micrometeoroids and space debris, which could cause severe injury or even death.

8.
Asphyxiation: Finally, without a constant supply of oxygen, you would eventually die from asphyxiation.

It's important to note that these effects are based on current scientific understanding and would occur in the absence of any additional protective measures or equipment.

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Even most astronomers don't know what would happen. NASA, however, does know. Occasionally during astronaut training, an astronaut's helmet accidentally comes loose in a vacuum chamber or something like that. ... When you're exposed to vacuum, the air in your lungs is forced out through your mouth.read more >>