Did you ever ride the Gravitron? You're pinned to the wall by forces three times that of normal gravity. It’s fun, unsettling can even make you puke. But what happens if your body experiences extreme changes in gravity for long periods, as is the case for an astronaut?
What were you doing at 3:19am Tuesday 27 January? That’s when a huge asteroid passed within 1.2 million kilometres of our planet. Fortunately that’s about three times the distance to the moon so we weren’t in any danger. But how often do rocks from space actually collide with Earth? And what happens when they do?
2024: the first human crew of four will set out on their 7-month one-way trip to Mars. They will establish a human outpost on this inhospitable planet and be joined by four new people every two years. This is the mission of Mars One. But are we really sure Earth-based technology can keep them alive?