Oldest Spiral Galaxy Shocks Astronomers
'Grand-design' spiral formed only 3B years after Big Bang
By Dustin Lushing, Newser Staff
Posted Jul 20, 2012 5:45 PM CDT
A stock illustration of a spiral galaxy.   (Shutterstock)

(Newser) – An ancient galaxy has flabbergasted astronomers. The perfectly formed spiral galaxy was born eons ago, a mere 3 billion years after the Big Bang. But this galaxy type was considered impossible so early on, when the cosmos was too chaotic to mold a "grand-design" spiral. How did it appear? Researchers say the old star system, dubbed BX442, formed because it received a gravitational "kick" from a smaller "dwarf galaxy" in its orbit, reports BBC.

"You can get a little extra help if you've got a satellite galaxy orbiting around," explains one scientist. "It gives that extra little gravitational kick to help accentuate the strength of the arm and make it into one of those eye-popping examples like the Whirlpool galaxy that you see all the pictures of."

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Showing 3 of 23 comments
Jul 21, 2012 7:59 AM CDT
Somehow they were not too shocked to offer a simple, plausible explanation.
Jul 21, 2012 3:16 AM CDT
How many Planets in a galaxy?
Jul 20, 2012 9:19 PM CDT
That Keck picture takes some good imagination to see spiral arms or a nearby dwarf galaxy.