The HUDF region is in the Fornax constellation and is only one-tenth the size of the full moon. Astronomers specifically chose this field of vision to do their study, Brinchmann told Seeker.
"This is the best studied place in the sky," he said, "so we knew there was a lot of support data that would help us interpret our very deep observations."
Brinchmann said he was able to use the Hubble data along with the new data the team acquired were key to understanding his observations.
Hubble's data "was very important for much of the badysis, as it helped us to unravel objects that were fuzzy from Earth's atmosphere," he said by email. "In fact, in many ways it was a very beneficial process for both parties: the value of the HST data is significantly improved with the information provided by MUSE, and without the HST data the results of MUSE would be much less easy to interpret."  The original HUDF image required 800 exposures taken across 400 Hubble orbits around the Earth, with a total exposure time of 11.3 days between September 24, 2003 and January 16, 2004. The new MUSE observations were taken during the course of two years with a total of 137 hours of telescope time.
MUSE was able to detect galaxies 100 times weaker than in previous surveys, viewing galaxies of various ages, sizes, shapes and colors. The smallest and reddest galaxies can be among the most distant galaxies known, which exist when the universe was 800 million years old. The spirals and elliptical galaxies, larger, brighter and well defined, were active approximately one billion years ago. The new observations provide additional information about the formation and evolution of galaxies over time.
In addition, the team found luminous haloes of hydrogen around galaxies in the early universe, providing new information about how material flows in and out of early galaxies.
The 72 newly discovered galaxies are those that only shine in light, Lyman-alpha, a form of ultraviolet light that usually indicates extremely distant objects. This is disconcerting because galaxies that shine in a single form of light have not been seen before. These galaxies are ready for a deeper study.
Brinchmann and his colleagues did not expect to find new galaxies in their observations.
"It surprised us," he said. "Finding new galaxies in itself is not so exciting, we find burdens everywhere we look if no one had been there before, but this was the most studied part of the sky, with the deepest images ever obtained, and it was a We were really surprised that we could find new galaxies that were not visible in these ultra-deep Hubble images, we did not expect to go beyond Hubble, forced as we were to look through the Earth's atmosphere. "
Other studies in the series of articles include the badysis of the fusion rates of galaxies in the early universe, mapping of the movements of the stars and observing the role of weak galaxies during the cosmic reionization that took place between 150 million of years and 650 million years after the Big Bang, when the first stars and galaxies formed.