Space elevators? Nuclear rockets? The future of space travel could look radically different. Imagine taking an elevator to space. Or blasting off in a nuclear rocket. That might sound like science ...

Imagine taking an elevator to space. Or blasting off in a nuclear rocket. That might sound like science fiction, but scientists are racing to develop new, more efficient methods of space travel - and ...

If extraterrestrials were visiting Earth, it would be the biggest news event since the Big Bang. So the seemingly endless speculation, obsession and recycling of stories about unexplained objects in ...