You are traveling on a spaceship when a meteorite is hit, the spacecraft is badly damaged and you are pushed out into space. What happens to your body if not protected by protective clothing?
The most obvious problem you will encounter is that there is no oxygen. So, you think you will take a deep breath to extend life for a few more minutes and as a result you die immediately. In a vacuum, air expands and breaks your lungs. So instead of holding your breath, exhale as much as possible to make sure your lungs are empty. Anyway the brain can remain conscious for about 15 seconds and you can survive up to two minutes to wait for rescue without any permanent damage.
Without atmospheric pressure, liquid water will quickly turn into a vapor. Humid places on the outside of your body, such as your eyes and tongue, will immediately boil, not because of heat, but a form of intense evaporation.
And yet, our body is 70% water and you know what happened, your body begins to expand like a balloon. Eventually you will inflate almost twice the normal size, but because human skin has incredible elasticity and durability, you won't burst. If you are rescued in time, you will gradually return to normal without any harm. But if not rescued, you will suffer the pain of tearing the liver.
Your circulatory system is so powerful, it can keep your blood pressurized even in the vacuum of space, so even though you inflate like a balloon, the blood continues to pump - at least until the amount of oxygen stored in the blood runs out.
Depending on your distance to the star, although not hot enough to burn you, without the protective gear, you could suffer severe sunburn immediately due to solar radiation.
Although outside the cold space of about -270 degrees Celsius but you can not be frozen. Your body can stay relatively warm for a long time. That's because your skin is a pretty cool insulator and space is vacuum, there's no convection or heat transfer like the atmosphere on Earth. So even though it is dead, the body's temperature will be preserved for a long time, which can be said to be very long.
On Earth, we are decomposed by the bacteria within us, billions of hungry little creatures being controlled by the immune system. But once your immune system stops working, those bacteria finally have a chance to turn you into a big feast. But in space is different, radiation and heat kill the bacteria before they can eat your body, leaving your dead body perfectly preserved for millions of millions of years.