The Universe

From devastating collisions to gigantic eruptions, scientists reflect on the 10 worst planetary catastrophes that shaped the fate of our solar system.

Experts study the theory of 'Nemesis,' a death star lurking at the edge of the universe that orbits the sun — and unleashes chaos every 26 million years.

Can the clues to the origins of the universe be hiding within its stars and planets? Scientists explore how the solar system emerged from nothingness.

Researchers analyze how astronauts could survive a crash landing on Mars, facing dwindling resources, lethal space storms and hostile alien conditions.

In its four billion-year history, Earth has seen mass extinctions and deep freezes. Scientists count down its seven worst days — and the scars they left.

With billions of stars and galaxies, the space statistics are mind-boggling. In this episode, astronomers use analogies to help us comprehend the cosmos.

UFOs and unearthly spacecraft have fascinated people for over a century. Experts review the science — and secrets — that may hold clues to alien life.

Specialists in faith and science search for answers as they explore the mysterious conception of the universe, what gave it life and why we are here.

Can the cold change our understanding of physics? Scientists brave the deep freeze of space as they search for the lowest temperatures in the cosmos.

Researchers investigate the mysteries of our galaxy as they uncover newly discovered moons and traveling planets on an astro tour of the Milky Way.