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7. Asteroids - Worlds That Never Were

Asteroids have a bad reputation as deadly rocks from space. They wiped out the
dinosaurs and will be back for us. But that's only half the story. Ancient
asteroids built the Earth. And they may have brought life to its barren surface.
Asteroids will shape our future as much as our past. They are the perfect
location for deep space colonies and could be the stepping stones that
eventually send humans out into the cosmos. From icy worlds with more fresh
water than Earth to flying mountains of pure metal, a hundred miles wide,
scientists are striving to unlock their secrets. Could these enigmatic space
rocks hold the key to how life in the Universe arises and is extinguished?

8. Birth of the Earth

The Earth is an amazing place. It provides everything needed to sustain
billions of creatures, plants and human civilization. We owe our very
existence today to the planet's turbulent past. Our world was formed by
a series of cataclysms, from the most powerful blast in the Universe to
a planetary collision that could have destroyed it. Yet without these events,
the Earth would not exist. Nor we. Could the same extraordinary chain of
events have created other earth-like planets elsewhere in the Universe?
Inhabited by creatures like us? The odds seem slim. But the incredible
story of the birth of our world reveals that earths must be abundant.
The question is no longer "are we alone" but "how far away are our neighbors?"