Dr. Michio Kaku explains that a wormhole is essentially a shortcut through space and time. Is time travel really possible? And if so, how do we avoid opening a metaphysical Pandora's box?
Will future space exploration be done by robots or humans? The Director of the Planetary Science Division at NASA, James Green, answers whether future space exploration will be done by humans or robots in this Curiosity video.
The greatest challenge posed by trans-galactic exploration may be the re-engineering of human life spans to match the time required for travel between star systems.
Take a look at the kinds of protective shelters we'd need in order to live on Mars' surface. Here's a hint: the shelters are more stone age than space age.