Let's See What's Out There
This is the helm of MV AURORA AUSTRALIS, where I've been staying for a few days. Unlike most Navy surface ships, you can drive while sitting. Below is the port bridge wing. There is a complete control station here and another on the starboard wing, for maneuvering in tight spots on the ice.
Over at the Interaction Point yesterday, Quasar9 left a interesting comment:
"If Space is not infinite but the inside of a balloon, it is logical there is an outside to that balloon. This may seem trivial to those working on spacetime, but you have effectively created Space outside spacetime, i.e. that Space where Time does not exist."
This echoes a question posed by a close colleague, "If Space is a sphere, then what is outside?"
That question has been on my mind a long time, especially on this journey down under. Here is my answer:
Picture a spherical Universe where our 3 dimensions are the surface. There is no centre in Space, for every bit resembles every other bit. There IS a centre in time, what we call a "Big Bang". This origin is the middle of the sphere with Space/Time expanding away.
Expansion of Space is indistinguishable from the forward flow of Time.
In math terms, R = ct. Radius R of the Universe is its age t multiplied by c. From this simple principle comes expansion, GM=tc^3 and many other predictions. As t increases the Universe expands. It can't expand at the same rate forever, because gravitation causes c to slow.
What is outside the sphere? The future! Personally I'd rather live in the future than dwell on the past. It's a very exciting future that we live in. It is our natural tendency to explore as the Universe expands. As the Captain of ENTERPRISE said: Let's see what's out there!