Science .

Scientists are on the verge of answering one of the greatest questions in history: Are we alone? Combining the latest telescope images with dazzling CGI, “Finding Life Beyond Earth” immerses audiences in the sights and sounds of alien worlds, while top astrobiologists explain how these places are changing how we think about the potential for life in our solar system. We used to think our neighboring planets and moons were fairly boring — mostly cold, dead rocks where life could never take hold. Today, however, the solar system looks wilder than we ever imagined. Powerful telescopes and unmanned space missions have revealed a wide range of dynamic environments — atmospheres thick with organic molecules, active volcanoes and vast saltwater oceans. This ongoing revolution is forcing scientists to expand their ideas about what kinds of worlds could support life. If we do find primitive life forms elsewhere in the solar system, it may well be that life is common in the universe — the rule, and not the exception.

Watch Wednesday, October 19, 2011 at 8pm.

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The Next Frontier: Engineering the Golden Age of Green cuts through the debate about global warming and climate change. Instead, it focuses on the renewable, clean energy technologies that can improve our future and create significant economic opportunities.

This entertaining one-hour documentary takes the viewer around the world in search of technologies and policies that will address the serious problem of excessive carbon dioxide emissions and our dangerous dependence on fossil fuels.

Airs Wednesday, July 27, 2011 at 10pm.