NASA is continuously studying the space and its objects through various powerful telescopes. It publishes its findings in leading journals of the world from time to time. On June 22, 2017, it has published surprising news related with old galaxies. NASA has captured the images of the galaxies through its Hubble Telescope. The telescope has taken more crisp images because of the gravitational lens in space. These new images have led the astronomers to come to a new conclusion about the formation and movement of the galaxies in the universe. This new thought has developed due to the image of massive, fast-spinning, disk-shaped galaxy. It had stopped star formation a few billion years after the Big Bang.
Earlier, the astronomers thought that the stars formed in shape of balls and these balls merged together to form galaxies. But now, the whole thinking has changed. Hubble has proved that the stars form in pancake-shaped disks. Thus, these older galaxies are a lot different from elliptical galaxies that we see in space. This is also surprising because the stars in elliptical and spiral galaxies are different than stars in this new dead disk-shaped galaxy. This also proves that the dead galaxies have passed through various changes in its makeover.
This new publication from NASA has changed the thinking of astronomers about the formation and evolution of the galaxies. Hubble has made it possible for the scientists to see in the center of the dead galaxy with the help of natural zoom lens in space.
The studies reveal that the dead galaxy is three times heavier than the Milky Way. Here, one thing is surprising and that is the size of the dead galaxy which is half the size of Milky Way. Rotational measurements with the help of Very Large Telescope (VLT) show its speed to be twice the speed of Milky Way.
The scientists are still unable to give the reasons of stoppage of star formation. This may be due to the equal rate of heating and cooling in the center of the galaxy. But, the scientists have answered the question of their evolution into present-day elliptical galaxies. It is due to the continuous merger of smaller companions with galaxies. These smaller companions come from different directions in different angles.