Exactly How Long You Could Survive In Space Without A Spacesuit?

In the below video, Neil deGrasse Tyson summaries precisely how long it would take you to meet your (awfully disastrous) death on the other planets in our solar system if you had no space suit. You might consider that your death would be completely instant, but this isn’t the case in reality. There are some places that you could stay alive, well, for a short time anyways. If you are lucky, you could live up to a few minutes.

But first…..


How long you could stay alive in the vacuum of space without any spacesuit?

Spending a day in the interplanetary vacuum without spacesuit might seem like a doubtful life choice. After all, in the movies, every time people end up in the cosmic void without proper safety either their heads blow up or they immediately freeze solid—if you are the one undergoing this unlucky turn of events, neither consequence is particularly possible.

Though, in reality, your death in space won’t be approximately as spectacular as Hollywood would have you consider. In fact, as long as you don’t attempt and hold your breath during decompression, you’ll stay alive for around 30 seconds before you bear any permanent damages. Granted, these 30 seconds won’t be the most pleasing moments of your life, but you won’t instantly die.

Luckily, heat doesn’t transfer rapidly in space as there is no air, water, or other medium to support the transfer. So neither freezing to death nor sudden combusting is an instant risk. Once you enter the vacuum of space, it will take about 15 seconds for your O2 deprived blood to get to your brain.  When this occurs, you’ll pass out. Eventually, the most instantaneous threat in the intergalactic vacuum is oxygen deficiency.

You won’t be killed by the decompressed surroundings, outrageous temperatures, or solar radiation. You’ll suffocate after a couple of minutes…and then your swollen body will drift pointlessly in the space for the rest of the day.Now then…


Neil deGrasse Tyson


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