How the Universe Works: The Search for a Second Earth DVD
The Earth is not alone. Over the past few years, astronomers have come to the realization that our galaxy may be home to billions of exoplanets. Scientists are scouring these exoplanets for evidence of atmospheres, liquid water, and even life. In the program, expert astronomers discuss the latest technology in the hunt for Earthlike planets, and reveal the conditions that need to exist to make a planet habitable.