Question: if you travelled to mars, how long would you survive before dieing?

Lowri Evans answered on 17 Mar 2016:

Let’s say you’ve spent many months on your deep space voyage, and you’ve finally made it into orbit around the red planet. Congratulations! Now you need to get down to the surface—and that’s going to be tricky.

The problem is Mars’ atmosphere. The air around Mars is quite thin–about 100 times less dense than the atmosphere around Earth. Spacecraft returning to our planet rely on a combination of parachutes and drag from the atmosphere to slow them down. The heavier the object, the more drag it needs to prevent it from slamming into the surface.

But with so little atmosphere surrounding Mars, gently landing a large amount of weight on the planet will be tough. Heavy objects will pick up too much speed during the descent, making for one deep impact.

Welcome to Mars! (That’s assuming you’ve made it down in one piece.) It’s time to get acquainted with your new home’s weather conditions.
Mars temperatures average around -62 degrees C, but swing wildly depending on the season, the time of day, and the location, ranging from 30 degrees C near the equator to -175 degrees near the poles. That means we’d will have to be equipped to battle harsh, bitter cold.

Living in a habitat on the Martian surface will be somewhat similar to living in the remote research outposts of Antarctica. All the food and supplies needed for these stations must come from other continents, and cargo resupply missions aren’t frequent.

Mars is just a bit further away from mainstream civilization than Antarctica is, and any resupply missions to a Martian habitat would take months or years to complete. If any colony hopes to survive on the red planet, there must be some form of self-sustainability when it comes to food. That means you’ll need some interplanetary farming skills.

Check this out: http://www.popsci.com/how-youll-die-mars