On Tue, 01 Jan 2019 07:52:37 -0700, Chris L Peterson
wrote:
On Tue, 01 Jan 2019 09:17:39 +0100, Paul Schlyter
wrote:

On Mon, 31 Dec 2018 09:28:28 -0700, Chris L Peterson
wrote:
But we must be inside the 4D sphere or else we would have no
future.

No, we are on the surface. The surface is "now". The center is
t=0
(actually, it is (0,0,0,0), the location of the Big Bang). The
past
is
inside the sphere, where it is not accessible to us.

Which means that in one second we will be almost one lunar
distance
outside this sphere? Since outside the sphere is where the future
is.

In one second the surface of the sphere will have moved outward by
one
second, placing everything in the Universe one second later.

As you probably know from relativity time isn't an absolute quantity.
If we regard time as just a coordinate (with light speed as the scale
factor to the space coordinates) then this "surface of the sphere"
will fill up the interior as well as the exterior of the sphe go
anywhere anytime and the "surface of the sphere" will be there!