The Universe

The dangers of manned space travel include the controlled explosion of a launch, the fiery crucible of re-entry and everything in between; how a spark inside a spacecraft or a micro-meteor could cause a catastrophe; black hole; gamma rays.

Parallel universes.

Ways scientists envision breaking the "light barrier."

The challenges of sex in space as humans move toward colonizing the cosmos.

Scientists, astrobiologists and astronomers theorize about life forms from other planets.

NASA arms itself with the latest technology to pre-empt a cosmic collision that could threaten mankind's existence; comets, asteroids and meteors help shape the universe; mass-extinction events.