What Webb will observe

The James Webb Space Telescope is set to peer farther back into the history of the cosmos than ever before. Its powerful instruments, including the Canadian-made NIRISS, will help unravel the mysteries of the earliest light in our universe. (Credits: Canadian Space Agency, STScI)

A vertical infographic with the James Webb Space Telescope looking back through time. From most recent: 9 billion years ago, Sun forms; a few billion years ago, quasar era, helium reionization; a few hundred million years ago, first galaxies, hydrogen reionization; dark ages; big bang.