As space travel for recreational purposes is becoming a very real possibility, there could come a time when we are traveling to other planets for holidays, or perhaps even to live. Commercial space company Blue Origin has already started sending paying customers on sub-orbital flights. And Elon Musk hopes to start a base on Mars with his firm SpaceX.

This means we need to start thinking about what it will be like to live in space—but also what will happen if someone dies there.

After death here on Earth, the human body progresses through a number of stages of decomposition. These were described as early as 1247 in Song Ci's The Washing Away of Wrongs, essentially the first forensic science handbook.

First the blood stops flowing and begins to pool as a result of gravity, a process known as livor mortis. Then the body cools to algor mortis, and the muscles stiffen due to uncontrolled build-up of calcium in the muscle fibers. This is the state of rigor mortis.

The idea of avoiding asteroid impacts has featured prominently in the public's mind for decades—especially since the release of movies such as Deep Impact and Armageddon. But is using a nuclear explosion the best way to deal with potentially hazardous space rocks? Decidedly not. If given enough time, there is a much more effective (and safer) way to deal with any object on a collision course with Earth—a gravity tractor. Now, Dr. Yohannes Ketema from the University of Minnesota has developed a flight pattern that makes this simplest of all asteroid defense mechanisms that much more effective.

Gravity tractors have been around for a while. They use the gravity of an artificial body to pull an object toward it and slightly change its trajectory. Over long periods, this would pull the hazardous object out of the current trajectory into a safer one. It also has the advantage of not requiring any direct impact or explosion on the surface of the asteroid itself.