The Discovery Channel mini-series When We Left Earth: The NASA Missions will conclude on Saturday June 22 at 9 PM ET and we want to celebrate this special program. We're running another contest and we're giving away the Ultimate Space Gift Set five-disc set. These boxed sets will surely go fast, so enter this contest today.

Winners Receive:

RELATED: Win Stephen King's The Stand on Blu-ray Signed by Director Mick Garris!

- Ultimate Space Gift Set five-disc set

CLICK HERE to enter this contest today.

From our closest neighbor (the moon) to distant galaxies, explore bizarre facts about the universe, intriguing what ifs, and fascinating answers that will inspire more questions.

95 Worlds and Counting

Visit the solar system's most exotic real estate, the moons. Once dismissed as trivial balls of ice, these celestial bodies may hold the key to life in space.

If We Had No Moon

Without the moon, days would last four hours, winds would blow with hurricane force, and Earth would be shrouded in a dense, toxic atmosphere. What luck that 50 million years ago, Earth sustained a major collision that created its moon!

The Day the Earth Nearly Died

The Permian mass extinction was the worst disaster ever to hit Earth. It shattered ecological order and changed evolution forever. Now, scientists shed new light on the mystery of the most destructive event in the planet's history.

Unfolding Universe

A team of astronomers and scientists try to find clues to the origins of our galaxy and try to locate a strange presence hidden deep in the core of the galaxy. What they find in this mysterious realm harbors clues to the origin of the world.

Understanding the Universe

Join astronomers and astrophysicists as they probe light years beyond the Milky Way. Get a close-up look at our sun, nebulas and supernovas, captured by the Hubble Space Telescope.