The Hunt for the First Galaxies

Seeking the first galaxies to form after the Big Bang is the primary rationale for building the James Webb Space Telescope (JWST). These first galaxies have eluded the Hubble Space Telescope (HST) because the expansion of the Universe has stretched their light to wavelengths undetectable by HST. With its increased sensitivity in infrared light, JWST has discovered hundreds of galaxies more distant than HST could possibly detect, and the first galaxies are forming stars earlier and more rapidly than expected.

Speaker: Dr. Marcia Rieke, University of Arizona