Imagining what it would be like to visit another planet has been a staple of science fiction for decades. Whether it's here in the Solar System or out somewhere else in the universe, other worlds tend to intrigue us. Yet it's worth remembering that humans exist on Earth, and not somewhere like Mars, for a reason — it's the only place in the universe that we know of that would not kill us horribly within minutes or less. This Newsweek story list the different ways humans would die on each planet in the Solar System, with Jennifer Glass, associate professor in the School of Earth and Atmospheric Sciences, providing gruesome details on the effects of asphyxia (lack of oxygen), extreme temperatures, and crushing atmospheric pressure on the human body.