Authors:
  • There's been a greater awareness among people, especially geeks, that the laws of physics don't allow that much wiggle room in terms of things like faster-than-light travel, time travel, sending people to other planets. It's harder than we were aware a few decades ago. I think there used to be this widespread imagination, this idea that we'd eventually just hop in a rocket and go to Mars.

    Source: www.avclub.com