Galaxies

[The Starmaker]

there are
billions
and
billions
of
galaxies
out
there...

Are they all the same age?

[unknown]

Post by The Starmaker
there are
billions
and
billions
of
galaxies
out
there...
Are they all the same age?

no

[The Starmaker]

Post by The Starmaker
there are
billions
and
billions
of
galaxies
out
there...
Are they all the same age?

no

so what is the age of our galaxy?

[Whisper]

Post by The Starmaker

Post by The Starmaker
there are
billions
and
billions
of
galaxies
out
there...
Are they all the same age?

no

so what is the age of our galaxy?

Nobody knows. Some stars emigrated from other galaxies & are older than
the galaxy they inhabit.



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[Greg Goss]

Post by Whisper
Nobody knows. Some stars emigrated from other galaxies & are older than
the galaxy they inhabit.

When I was young, the universe was considered to be just over 15
billion years old. Sometime later that was revised to 13 point
something. For a while after that adjustment, there were clusters
with assigned ages older than the universe.

[David DeLaney]

Post by Greg Goss

Post by Whisper
Nobody knows. Some stars emigrated from other galaxies & are older than
the galaxy they inhabit.

When I was young, the universe was considered to be just over 15
billion years old. Sometime later that was revised to 13 point
something. For a while after that adjustment, there were clusters
with assigned ages older than the universe.

I finally got edumacated on a concept I'd been missing: we can see back to the
cosmic microwave background, which is 13.6 billion lightyears away (in all
directions) and is hiding the Big Bang about 400,000 ly further out. So the
universe is 13.6 billion years old (approx)... but the galaxies and phenomena
(doo du, doo doo doo) that we are seeing way out there are now, due to being
carried along by (calculated) expansion, about _46_ billion ly away from us,
which means we'll never get to see their current positions at all, due to
more expansion in the meantime. (Plus, you know, extinction/reinvention of the
species and all that.)

But that's where the "the observable universe is 'currently' 92 billion ly
across" concept I was previously unable to digest or agree with was coming from
- this update provided as a possible public service.

Dave, who has discovered PBS Space-Time youtube videos

[The Starmaker]

Post by The Starmaker

Post by The Starmaker
there are
billions
and
billions
of
galaxies
out
there...
Are they all the same age?

no

so what is the age of our galaxy?

it appears that our galaxy and the universe are both the same age..