Astronomers announced on the 18th that they used the Hubble telescope to detect for the first time a spiral galaxy formed early in the universe, about 10.7 billion years ago, billions of years earlier than many other spiral galaxies. Researchers say this discovery prompts people to rethink how galaxies formed after the Big Bang. The discovery was published in the July 19 issue of Nature. The Hubble Telescope photographed about 300 distant galaxies formed by the early universe. This oldest galaxy is called BX442. According to its distance, it was formed about 3 billion years after the Big Bang, and it took 10.7 billion years for the light emitted here to reach Earth. It is much larger than galaxies in other early universes. According to analysis, galaxies of this mass in the universe account for only about 30%. "The galaxies in the early universe looked strange, patchy, irregular and asymmetric." Said Alice Shapley, co-author of the paper and associate professor of physics and astronomy at the University of California, Los Angeles (UCLA). "Most ancient Galaxies look like wreckage of trains. "In the early universe, galaxies often collided together, and the gas between the galaxies settled to nourish the stars. At that time, stars and black holes grew much faster than today. There are many types of galaxies in the universe, including spiral galaxies. For example, the Milky Way is a rotating disk consisting of stars and gas; elliptical galaxies, which contain older red stars, which move randomly; mixed galaxies, which exist in In the early universe, the galaxies contained were more diverse and irregular. The lead author of the paper, David Rowe, a postdoctoral fellow at the Dunlap School of Astronomy and Astrophysics at the University of Toronto, said: "The current view is that this 'macro design' spiral galaxy cannot exist in the early universe." The "macro design" galaxy is Refers to a galaxy with prominent, beautifully shaped spiral arms. "BX442 doesn't seem to be far away." Sharpley said that in order to make sure that these two galaxies did not happen to be linked together in the photo, they used OSIRIS (Optical Spectrometer and Infrared Imaging System) at WM Keck Observatory in Hawaii. The instrument further analyzed the spectrum emitted by about 3600 sites around BX442 and finally determined that it was a rotating spiral galaxy. "When we got the spectrogram of the galaxy and saw its spiral arm at first glance, the first feeling was that it was misguided by the photo. This may be just an illusion." Sharpley said, but they also found the existence of a huge black hole in the center of the galaxy Evidence, it is possible that black holes played a role in the evolution of BX442. Sharpley said that BX442 looks more like an ordinary galaxy in today's universe, but very rare in the early universe. It represents a connection between early chaotic galaxies and rotating spiral galaxies. "It has the potential to reveal the importance of merging in every cosmic period that produces a 'macro design' spiral structure." The researchers said they will continue to study BX442. "We hope to take pictures of it at other wavelengths, so that we can determine what type of galaxy is at that location, and draw the mixture of stars and gas in BX442." Sharpley said. Cool Tech Fat Freezing Machine,360 Criolipolisis Double Chin Removal,Fat Freezing Slimming Machine Xi'an Double H Health Technology Co., Ltd , https://www.xadoubleh.com
Hubble telescope discovers the oldest spiral galaxy to date