The Universe (2007)

S3E9 Another Earth

Are we truly one-of-a-kind in the universe, or could there be another Earth-like planet out there among the stars? Could Alpha Centauri, our closest stellar neighbor, host a planet similar to ours? While discovering Earth-sized planets has proven challenging, new indirect techniques are emerging that promise to help scientists better estimate the number of such worlds in existence. Just how uncommon would it be to encounter life on another planet resembling Earth?