Astronomers turned to the CR7 Galaxy to look for clues on the early days of the Universe. The star system is considered to be one of the oldest ever discovered.
It seems that light was not permitted to travel during the first millions of years after the Big Bang.
A study presented at a recent astronomy convention in England showed a new model of the Universe based on the observations made by three different telescopes placed in Hawaii and Chile.
Scientists believe that the ultraviolet light emitted by stars and black holes was so dense that it split hydrogen atoms.
Moreover, the galaxies were surrounded by space materials that obscured the light shed by their composing stars, making them be hidden in the darkness.
“The fainter galaxies seem to have stayed shrouded for a lot longer. Even when they eventually become visible, they show evidence of plenty of opaque material still in place around them,” said David Sobral from the UK Lancaster University.
In 2015, the Sobral telescope in Hawaii spotted for the first time the CR7 Galaxy and MASOSA. The two formations are now considered to be the oldest discovered so far, and they might even contain the stars from the first generation.
The two galaxies are not singular, as a Japanese team advanced a third galaxy, named Himiko, which exhibits the same characteristics. Even so, the challenge in finding this type of star families is much more complicated than it may seem.
Scientists believe that the Big Bang created a dense universe containing neutral hydrogen that blocked the travel of light. Only after the reionization epoch did the light start to penetrate the Universe.
The study presents a total of five galaxies that show a large mass of ionized gas surrounding them. The presence of the gas cover led scientists to believe that these particular galaxies did not change much after the Dark Ages of the Universe.
In comparison, the new bright galaxies can create a gas cover all by themselves. In the case of the five old families of stars, the surrounding gas mass is a leftover from the old days, and it was not created by the galaxies.
The most impressive conclusion of the study is that the earliest galaxies emerging from the Big Bang are not as rare as it was initially believed. The scientists proved them to be also very diverse and offering a lot of interesting information that can lead to a more accurate model of the Universe.
The Cosmos Redshift 7, or CR7, is a galaxy that emits a high-redshift Lyman-alpha radiation. It is situated 12.9 billion light years distance from the Earth, in the Sextans constellation. The name of the galaxy is a tribute to the Real Madrid footballer Cristiano Ronaldo.
Image Source: Vimeo