The Big Questions

At the beginning of the 21st century, we stand at a unique time in our exploration of the heavens. The exploratory voyages of the next few decades have the potential-within our lifetimes-to answer age-old questions about how life begins, whether life exists elsewhere, and how we could live out there.

NASA has defined a set of space and Earth Science questions that can best be addressed using the Agency’s unique capabilities.  NASA works with the broader scientific community, considers national initiatives, and the results of decade-long surveys by the National Research Council in defining these questions.

See also the Science Strategy section for more information about how NASA Science is pursuing these questions.