Episode 17: Third Light's the Charm

About this video
Duration: 2 minutes, 41 seconds

Before light from the universe reaches Webb's cameras and science instruments, it will reflect off four different mirrors — the primary, secondary, tertiary, and fine-steering mirrors. The light's third stop along its zigzagging path is the tertiary mirror, housed within the Aft Optics Subsystem at the center of Webb's 21-foot primary mirror. Mary Estacion visits Ball Aerospace in Boulder, Colo., to learn about the tertiary mirror's role and to see how the mirror's optics are being tested.

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More information about this video and Webb's mirrors


Tags
Interview, James Webb Telescope, Missions, Telescopes

Credits

NASA and Mary Estacion (STScI)

Publication: January 31, 2013

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