WASHINGTON: Giant galaxies that contain billions of stars are born in much the same way as delicate snowflakes, a new research has revealed.
An international team, led by Swinburne University of Technology, has provided the first direct evidence to support a theory of galaxy formation that he has likened to the birth of a snowflake.
Researchers analysed data from three different telescopes in order to help confirm this galaxy formation theory proposed last year by German astronomer Ludwig Oser and his colleagues.
"What we've found is that galaxies form in two phases. Firstly, an inner region of stars is formed from collapsing gas. This region then acts as a core, or 'seed', around which the galaxy grows as the result of stars which are acquired from other smaller galaxies," Prof Duncan Forbes, who led the team, said.
Team member Prof Jean Brodie of the University of California said, "Our work provides some of the best evidence for this inside-out build up of giant galaxies."
What intrigued the astronomers was the similarity between this inside-out process for giant galaxy formation and the way that snowflakes are formed.
"Snowflake formation requires a 'seed' to get it started. In the case of snowflakes, that 'seed' is a microscopic dust grain. Having a core from which to build upon is comparable to the formation of a giant galaxy.
"Then, in much the same way as water vapour accumulates to grow the snowflake, small galaxies and their stars are accreted onto the galaxy core," Forbes said.