Gravity Assist: Meet a Webb Scientist Who Looks Back in Time

Gravity Assist: NASA's Interplanetary Talk Show

The James Webb Space Telescope awed the world on July 12 with its first images and data. And it’s just getting started with its exploration of the cosmos. Dr. John Mather, the observatory’s senior project scientist, has been working toward this milestone for more than 25 years. Before Webb, he worked on a spacecraft that delivered a groundbreaking baby picture of the universe and offered the best evidence yet that the universe began with a rapid expansion we call the big bang. Dr. Mather describes some of the first images and explains the mysteries that Webb will tackle.