The James webb telescope is a space telescope, just like the hubble. And now we can really capture the light that is coming from far, far away. It took four point six billion years for that light to reach our planet. We're actually seeing what happened in the earlier part of the universe. These are photo detectors that operate at nearly a the coldest point in the universe, negative 263 kelvin. That makes it extremely sensitive. Using a 20 foot wide mirror, we can capture all the light that's coming in and concentrate on one spot.