Cosmic Journeys

1. 

   E1. Birth of the Moon

   Jul 20, 2009 · 24m

   Scientists have been reconstructing the history of the Moon by scouring its surface, mapping its mountains and craters, and probing its interior. Find out what the origins of the Moon can tell us about our own planet's beginnings.

2. 

   E2. Attack of the Sun

   Jul 27, 2009 · 24m

   Massive solar eruptions take aim at our high-tech society. 93 million miles away... an angry sun vents its rage. Dark regions, called sunspots, appeared unexpectedly on its surface... a sign of rising tension within. It had been three and a half years since the sun last erupted in fury...at the peak of an 11-year cycle of solar flare-ups.

3. 

   E3. Super Hurricanes

   Aug 12, 2009 · 24m

   Why some tropical storms erupt into monster hurricanes capable of wrecking coastlines. Can they be predicted? Hurricanes are tropical storms that feed on solar heat captured by the oceans. When conditions are right, a hurricane can release this energy in a fury of wind and rain.

4. 

   E4. Saturn's Mysterious Moons

   Aug 20, 2009 · 24m

   From the Cassini spacecraft comes one of the greatest photographic collections. Scientists are using it to uncover a trail of clues pointing to the energy sources and complex chemistry needed to spawn life.

5. 

   E5. The Largest Black Holes in the Universe

   Sep 27, 2009 · 24m

   Our Milky Way Galaxy is thought to harbor millions of black holes, the ultra dense remnants of dead stars. But now, in the universe far beyond our galaxy, there's evidence of something far more ominous. A breed of black holes that has reached incomprehensible size and destructive power. Just how large, and violent, and strange can they get?

6. 

   E6. How Large Is the Universe?

   Oct 20, 2009 · 24m

   The mind-blowing answer comes from a theory describing the first micro-moments of our universe. Just as scientists began to make precise measurements of the observable universe, new ideas suggest that our visible patch is an impossibly small portion of the whole.

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