RT @NASAWebb: This Hubble Ultra Deep Field contains approximately 10,000 galaxies, extending back in time to within a few hundred million years of the big bang. What do galaxies that existed even earlier look like? Two teams using #NASAWebb will revise what we know: https://t.co/uGHrCQeCJ1 https://t.co/oqCttOBc1k