(NOTE: This talk was given in 2010, and this field of science has developed quickly since then. Read "Corrections & Updates" below for more details.) Astronomer Dimitar Sasselov and his colleagues search for Earth-like planets that may, someday, help us answer centuries-old questions about the origin and existence of biological life elsewhere (and on Earth). Preliminary results show that they have found 706 "candidates" -- some of which further research may prove to be planets with Earth-like geochemical characteristics.

Dimitar Sasselov: How we found hundreds of potential Earth-like planets

How we found hundreds of potential Earth-like planets

Reburial of Copernicus, pioneer who placed the Sun at the Solar System's center, underscores DNA's role in unlocking historical mysteries.

Kepler Telescope's hunt for Earth-like planets revitalizes our cosmic quest, revealing a universe rich with potential homes for life.

Exploring biochemistry's universality could redefine life's cosmic significance, suggesting Earth's unique role in the universe's vastness.