Credit: NASA, ESA, S. Beckwith (STScI) and the HUDF Team.Click on the image to expand.
The Hubble Deep Field revolutionised the study of the early universe and turned some of the most established theories of galaxy formation on their heads. Eight years on, NASA used the HST to look even further back in time, to the so called “Middle Ages” of galaxy formation.
The image above is a composite of one million second exposures made with both the ACS and the NICMOS instruments and covers redshifts in the range 7–12. By studying these exposures, we can learn about what the universe was like only 400 million years after the big–bang.
William Reece, 2004