Unlock the secrets of our celestial history!  Early Earth was a molten hellscape, meteor-battered, and devoid of atmosphere. But how did we get our life-sustaining blue sky? Join us for NOVA's "Ancient Earth: Birth of the Sky" tonight at 9 to find out.  | Vegas PBS | Facebook

Uncover the truth behind the first circumnavigation of the earth, the untold stories of prehistoric women, the mystery of the fatal Hindenburg airship crash, and more in the new season of Secrets of the Dead! New episodes begin this Wed at 10 pm on PBS. [VID: Clips from episodes in the new season of Secrets of the Dead. End card reads: "New Season Wed Oct 20th 10/9c." Transcript: On Secrets of the Dead... The 16th century will be the age of discovery. The female was simply forgotten. As an arche