#Universe #Galaxies – There Are 10 Times More Galaxies In The Observable Universe Than Originally Thought : The observable universe has more galaxies than initially thought. This finding follows the deep-sky census that assessed the data from NASA’s Hubble Space Telescope and other observatories.
The real population of galaxies might be 10 times more than the observable universe, according to astronomers who did the data-crunching.
Leading the study was Christopher Conselice of the University of Nottingham in the UK. The team’s research paper will soon appear in The Astrophysical Journal.
It makes a significant contribution in offering clues to galaxy formation and in solving the astronomical puzzle as to why the sky looks dark at night.
“These results are powerful evidence that a significant galaxy evolution has taken place throughout the universe’s history, which dramatically reduced the number of galaxies through mergers between them – thus reducing their total number. This gives us a verification of the so-called top-down formation of structure in the universe,” explained Conselice.
According to the study, most galaxies in the past were small and their masses are comparable to satellite galaxies at the Milky Way.
Conselice and his team reached important conclusions using deep-space images from Hubble and published data from other sources.
The study explained that starlight from the galaxies is invisible to the human eye and modern telescopes because extraneous factors reduce visible and ultraviolet light in the universe. The expansion of space causes reddening of light due to the dynamic nature and absorption of light by intergalactic dust and gas.