In 2015, Dzhoritt Matti suggested that he had found an extremely distant galaxy CR7, in which there were no elements heavier than helium. After 3 years, the ALMA telescope showed that there is carbon in the galaxy and even in normal concentrations.
During earlier studies (2015), Matti's team considered that they were the first to manage to find a galaxy with first-generation stars: extremely massive and glowing stars that do not contain heavy elements (only helium and hydrogen). The search for such objects is important because they reveal data on how stars formed after the Big Bang. In addition, these are the first bodies that have enriched the Universe with heavy elements, such as carbon, oxygen and nitrogen. A new study indicates that the CR7 has heavy elements.
The 2015 study used the Very Large Telescope (Chile), which measures the spectrum of visible light. New analysis conducted using ALMA (Chile), focused on microwaves. The array focuses on gas, located between the stars, and not directly in the starlight. Carbon was found in this gas. The galaxy is distant by 13 billion light years. That is, at that time the space was only 700 million years old. This is precisely the moment when large galaxies began to appear. Measurement methods are important, because terrestrial telescopes are forced to face a barrier in the form of the atmosphere of our planet. That is why everyone is looking forward to the launch of the James Webb space telescope.
This study proves once again that science is constantly evolving and its facts are subject to change. To find the stars of the first generation, will have to move on CR7.