The blue marble we call Earth remains in large part a mystery to the 8 billion people who live on it. How did Earth come to exist, and what are the secrets of its survival? How long will humans be able to call it "home"?

As we make plans to travel beyond the Moon to new worlds, how are we preparing to become human extraterrestrials? Just how will we survive this trip into the unknown? And what will we do if we make contact with intelligent life?

We've been fascinated by our nearest planetary neighbor, Venus. It's about the same size as our world, covered in massive volcanoes and poisonous clouds of acid rain. Is Venus our evil twin or a warning about what Earth will become in the future?

From massive asteroids and deadly bursts of radiation to microscopic alien viruses, each cosmic dangers may end human civilization as we know it. Can we prepare for the inevitable calamity that may be coming our way? Or are we doomed to oblivion?

We humans want to boldly go into uncharted territories to make new discoveries. As the next era of space exploration begins, what will we find when we reach other planets? What dangers will we face when we try to conquer these new frontiers?

Earth's moon is only one of hundreds in the solar system, each of them a mysterious and often bizarre world. Could alien moons offer a key to exploring outer space and perhaps even finding a new home for humanity?

Humanity has worshipped the Sun since the beginning of time, and yet even with our modern technology, we still know so little about it. Could unlocking the mysteries of the Sun be the difference between life and death for human civilization?