Astronomer Lisa Kaltenegger ponders the possibilities of life beyond planet Earth, and presents new scientific research that suggests we are not alone in the universe.

For as long as humans have existed, we have wondered what lies beyond our night sky. Is it possible that some of those pale dots are home to life similar to ours?

In her 2024 book, Alien Earths, astronomer Lisa Kaltenegger helps us ponder this timeless question.

Assessing research from the last 30 years, Kaltenegger explains why it's increasingly likely that life beyond our planet exists, and how new discoveries keep changing our understanding of the universe.