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NOVA
The Planets: Mars Preview
Mars was once a blue water-world studded with active volcanoes. But when its magnetic field and protective atmosphere faded, it became the frozen desert planet we know today. With so many necessary elements in place, did life ever form on Mars?
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50:52
Journey back to the beginning of everything: the universe, Earth, and life itself.
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51:52
Journey back to the beginning of everything: the universe, Earth, and life itself.
Unlock with PBS Passport
53:50
An American combat hospital mobilized in Iraq faces a daily drama of wartime treatment.
53:06
Will experimental particle physics confirm the wild predictions of string theory?
52:56
Do miniscule vibrating strands of energy hold the key to a unified theory of physics?
52:55
Combining the laws of the universe in one theory that explains it all is the Holy Grail
