Season 4

01 Glacier Meltdown Episode 131st January 2007 02 Destructive Forces Episode 221st February 2007 03 Stone Age Apocalypse Episode 328th February 2007 04 Comets Episode 47th March 2007 05 Prehistoric Americans Episode 514th March 2007 06 Deep Space Probes Episode 627th March 2007 Great distances and dangerous environments make robotic spacecraft the best way for scientists to explore our solar system. Acting as our eyes and ears, these probes have revealed secrets about the distant planets and their moons, their surfaces, weather and environments. 07 Dino Meteor Episode 712th April 2007 08 Planet Storm Episode 826th April 2007 09 Polar Apocalypse Episode 91st April 2007 10 Killer Lakes Episode 103rd May 2007 Since the death of 1,700 people near a lake in Africa, scientists have uncovered a terrifying series of hazards in lakes across the world. 11 Ring of Fire Episode 112nd August 2007 12 Alien Safari Episode 129th August 2007 With advanced technology in their hands, astronomers and scientists may now be capable of detecting extraterrestrial life in the universe. In fact, some think the proof may be found in as little as a decade. Astronomers involved in the effort, including those at SETI (Search for Extraterrestrial Intelligence), discuss the possibilities and the likely spots for finding life outside of Earth. 13 Hyper Hurricanes Episode 1318th October 2007 14 Dangers of the Deep Episode 1425th October 2007 15 Solar Force Episode 1530th October 2007 16 Birth of the Solar System Episode 166th November 2007 Thanks to new developments in the technology of astronomy, scientists have been able to collect new information, giving them clues to how our solar system was formed. 17 Hubble Trouble Episode 176th November 2007