At most, an astronaut without a suit would last about 15 seconds before losing conciousness from lack of oxygen. (That's how long it would take the body to use up the oxygen left in the blood.) Of course, on Earth, you could hold your breath for several minutes without passing out.
Consequently, can you breathe in outer space?
Whatever you do, don't hold your breath! The vacuum of space will pull the air from your body. So if there's air left in your lungs, they will rupture. Any exposed liquid on your body will begin to vaporize.
Beside above, do astronauts breathe pure oxygen?
Once in their suits, astronauts breathe pure oxygen for a few hours. Breathing only oxygen gets rid of all the nitrogen in an astronaut's body. If they didn't get rid of the nitrogen, the astronauts might get gas bubbles in their body when they walked in space.
How does space station get air?
Most of the station's oxygen will come from a process called "electrolysis," which uses electricity from the ISS solar panels to split water into hydrogen gas and oxygen gas. The hydrogen is used for making sugars, and the oxygen is released into the atmosphere.
How many dead bodies are in space?
As of 2020, there have been 14 astronaut and 4 cosmonaut fatalities during spaceflight. Astronauts have also died while training for space missions, such as the Apollo 1 launch pad fire which killed an entire crew of three. There have also been some non-astronaut fatalities during spaceflight-related activities.