View Single Post
  #2  
Old June 23rd 17, 04:06 AM posted to sci.astro.research
wlandsman
external usenet poster
 
Posts: 43
Default A new impossible galaxy

On Wednesday, June 21, 2017 at 9:27:03 PM UTC-4, jacobnavia wrote:

Sure, but excuse me, a star like the sun, yellow, main sequence star, is
5 Gy or more old. All stars in that galaxy (z=2.1) can't be older than
2Gy. To keep things in order, galaxy formation is questioned, but not
the big bang theory.


The published paper
( https://arxiv.org/ftp/arxiv/papers/1706/1706.07030.pdf ) gives an
observed spectroscopic age of the galaxy of log[Age(yrs)] = 8.97
(+0.26,-0.25) or between 500 million and 1.7 billion years. This
is comfortably within its cosmological age at a redshift of z=2.15
of 3 billion years.

(Yes, the Sun is currently a 4.6 billion year old yellow main
sequence star. But yellow, main sequence stars can be much younger
than the Sun. For example, 4 billion years ago, the Sun was a
600 million year old yellow main-sequence star.)

--Wayne