[ExI] Observable Universe contains ten times more galaxies than previously thought

[Anders]

Yes, this news is based on a very odd use of the present tense. 
Astronomers may be fine with considering the "present" as the surface of 
our past light cone, but most of us prefer to consider the unreachable 
volumes with the same cosmological time as us as being "now".


On 2016-10-13 17:14, BillK wrote:
> Observable Universe contains ten times more galaxies than previously thought
> October 13, 2016
>
> <http://phys.org/news/2016-10-universe-ten-galaxies-previously-thought.html>
>
> Quotes:
>
> In analysing the data the team looked more than 13 billion years into
> the past. This showed them that galaxies are not evenly distributed
> throughout the Universe's history. In fact, it appears that there were
> a factor of 10 more galaxies per unit volume when the Universe was
> only a few billion years old compared with today. Most of these
> galaxies were relatively small and faint, with masses similar to those
> of the satellite galaxies surrounding the Milky Way.
>
> These results are powerful evidence that a significant evolution has
> taken place throughout the Universe's history, an evolution during
> which galaxies merged together, dramatically reducing their total
> number. "This gives us a verification of the so-called top-down
> formation of structure in the Universe," explains Conselice.
> ----------------
>
>
> For a minute I was worried that this means it would take me ten times
> longer to visit them all, but apparently as we are looking into the
> past they have now merged down into a much more reasonable number.
> (For a big definition of 'reasonable').
>
> BillK
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-- 
Dr Anders Sandberg
Future of Humanity Institute
Oxford Martin School
Oxford University