The two Voyager spacecraft have traveled farther than any human-made object in history. As they reach interstellar space, experts explore their most astonishing discoveries and how their extended operation has transformed into the ultimate mission.

Determining the age of the universe continues to be an elusive endeavor for scientists as their results are conflicting. Without a definitive answer, everything known about the cosmos could be completely wrong.

Earth's history is marked by one cosmic disaster after another, forging the path of human evolution; now, experts explore how the Earth has teetered on the verge of destruction.

Dark Matter is thought to be the cosmic glue that holds the universe together, yet the search for it continues to elude scientists today.

Cosmic rays capable of destroying human DNA are hurtling through outer space like subatomic bullets, causing space crews radiation damage.

New astronomical research is beginning to reveal an invisible scaffold of dark matter known as the Cosmic Web. This intergalactic network transformed the universe from a chaotic Big Bang into the structured beauty of the present-day cosmos.