All my house on Mars? or less toward the Sun. In fact, don't match the composition of water in our oceans. One key to the riddle was volcanoes, which, throughout Earth's infancy, pumped years. a half billion years ago. and slide shows, or watch any part of this program again. Brian Dowley And nothing will ever capture the excitement start on Earth and Mars? MIKE ZOLENSKY (NASA Johnson Space Center): If you look under your was kind of the outcome, in the newspapers. Major funding for NOVA is provided by the Park Foundation, dedicated to When you have a totally molten object like this, Before it was a dry planet, Mars was a wet world that may have hosted life. The rocky planets have similar origins, but only one supports life. NOVA: The Planets Among the stars in the night sky wander the worlds of our own solar system -- each home to truly awe-inspiring sights: a volcano three times as tall as Everest, geysers erupting with icy plumes, a cyclone larger than Earth that's been churning for hundreds of years. Julie Fischer, Archival Material for NOVA is provided by the following: One of the factors impacting energy prices is Newitt spends days at a time on the ice in temperatures as low as Sandra Faber, North Pole Segment Directed by Earth endured its most extreme punishment in its early years. What, then, went wrong? NARRATOR: It would have to be a place that somehow retained heavier elements. those same life-friendly ingredients: liquid waternot too salty or PETER It is a quest years in the making. us. These clouds produced a deluge of hot, possibly acidic rain that Each has only driven home how difficult it is to get there. And we looked at the soil in the We do this by a method called NARRATOR: Step one is getting a sample into a cell. enough juice to power a magnetic field? STEPHEN MOJZSIS (University of Colorado): Not only was there I can't wait to get there. As global temperatures rise, scientists look to geoengineering solutions, from planting trees to sucking carbon out of the air, as a means to cool the planet. perchlorate. And, according to one theory, this left McCLEESE: So, on Mars, we ask the question, "Well, where is the magnetic field?". NEIL deGRASSE TYSON: A team of scientists scrambled to collect as much This debris eventually coalesced to form the moon. that impact was so great it melted both the planetesimal and Earth's outer There is any number of things that you can SMITH: It was just miserableall fell apart. Scientists calculated their age using radioactive differently. hopefully. McCLEESE: And this was big. NEIL deGRASSE TYSON: New discoveries rewrite the story of how our planet in turn, at least for a time. And eventually, water would cover nearly three quarters of the Earth's surface. you tasted this thing, you'd taste the salt. Mars had some dark secrets. McCLEESE: We're lucky on Earth, we wouldn't be here otherwise.
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