what is the biggest thing in the world?? (on the basis of astronomy)
Answers
Answer:
Virgo Supercluster. A cosmetic structure
Answer:
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Explanation:
The biggest supercluster known in the universe is the Hercules-Corona Borealis Great Wall. It was first reported in 2013 and has been studied several times. It's so big that light takes about 10 billion years to move across the structure. For perspective, the universe is only 13.8 billion years old.
The structure first came to light as the research team (led by Istvan Horvath of the National University of Public Service in Hungary) was looking at brief cosmic phenomena known as gamma-ray bursts. It is thought that they come from supernovas, or massive stars that explode at the end of their lifetimes.
Gamma-ray bursts are thought to be a good indication of where huge masses of stuff lie in the universe, because big stars tend to congregate in dense areas. The first survey showed gamma-rays particularly concentrated about 10 billion light-years away in the direction of the Hercules and Corona Borealis constellations.
But it's a puzzle as to just how that big structure came to be. A 2013 article from Discovery News (a partner site to Space.com) pointed out that this structure appeared to go against a principle of cosmology, or how the universe formed and evolved. Specifically, this principle says that matter should be uniform when seen at a large enough scale. The cluster, however, is not uniform.
"I would have thought this structure was too big to exist. Even as a coauthor, I still have my doubts," Jon Hakkila, an astronomy researcher at the College of Charleston in South Carolina, said in a 2014 press release. He said there was a very small chance the researchers saw a random number of gamma-rays in that location, but it is far less than one in 100.
"Thus, we believe that the structure exists," he added. "There are other structures that appear to violate universal homogeneity: the Sloan Great Wall and the Huge Large Quasar Group ... are two. Thus, there may very well be others, and some could indeed be bigger. Only time will tell."