Thomas Zurbuchen said other top goals for science and the agency include understanding and protecting life on Earth and probing fundamental aspects of the universe like dark matter and dark energy.
Origin of life
Did Solar Flares Cook Up Life on Earth?
Scientists have found that "super" solar flares could have warmed the ancient planet and jump-started life.
New NOVA TV Show Explores Coevolution of Rocks and Life
Mineralogist Robert Hazen and other scientists probe connections between living organisms and rocks in "Life's Rocky Start," which premieres tonight on PBS stations around the United States.
Where Curiosity Has Taken Us
The Curiosity rover, one of NASA's flagship missions, analyzes Martian geology, geochemistry, climatology, and radiation to assess whether Mars could have supported microbial life.
Curiosity Rover Finds Organic Molecules on Martian Surface
Scientists assess the present and past habitability of Mars from organic compounds detected at Gale Crater.