closed universe, flat space?

On Apr 23, 12:23 pm, RichD wrote:

Supposedly, our universe is closed and finite, although the
geometry and topology isn't precisely known. This means
a straight line (geodesic) traveler must return to his starting
poiint, yes/no? Hence, curved space.

First, we need to consider how one would observe his own local space.
If his local space is curved, can he tell? Although this question
addresses the borderline with philosophy, common sense should say that
one cannot tell at all since his own set of rulers will be equally
curved. Thus, every observer will always observe his own local space
as being flat. Only after comparing with a remote space that one can
tell whose space is curved relative to the other. Curved space can
only be relative. Even if space curved back onto itself, one will
eventually return to his original position in his infinite future.
shrug

At the same time, astronomers claim, that space is flat, to
the precision of their measurements.

Cosmology does not fall into the domain of astronomy. Cosmology is
more like occult science where these guys try to create reality with
pure speculations. shrug

Static remote space will always be observed as flat. One can only
tell if the remote space is curved compared to his own local space by
observing the geodesic behavior of an object. shrug

Of course, this is not GR says. GR is voodooism. shrug

Usually, this is
accompanied by the comment that the universe is balanced
between infinite expansion, or eventual collapse, we can't
tell which.

With null vacuum density in mass, both the Newtonian universe and GR
will result in an eventual collapse of the universe. By allowing a
negative vacuum density, both will allow an expanding universe since
negative mass manifests antigravity. shrug

So, space is closed, but also flat... back in my day, they
had something called a logical contradiction, which was
considered a bad thing, but I guess times change...
viva progress -

That progress is assimilation of a religion in progress. It takes
several generations for a religion to take hold, but it takes longer
to wean these morons off that same religion. Better education seems
not to help. shrug