With the increase of gas temperature, the collision between gas molecules intensifies, and the molecules are broken into single gas atoms, which is Atomic gas 。
Research findings
In 2022, the National Astronomical Observatory of the Chinese Academy of Sciences used FAST to make imaging observations, and found a huge atomic gas system with a scale of about two million light-years, that is, a large number of diffuse hydrogen atomic gas, in the dense galaxy cluster - "Stephen Quintuple Galaxy" and the surrounding sky region. This is the largest atomic gas system ever detected in the universe. This achievement was published in the international academic journal Nature at 23:00 on October 19, 2022 Beijing time. This discovery indicates that there may be more such large-scale low-density atomic gas structures in the universe, posing a challenge to the study of the evolution of galaxies and their gases in the universe. [1]
