Recent content by supernova1054

To me, your “...focusing on...” seems better suited to physics.

In the basic homogeneous and isotopic model of our universe, the universe expands in such a way that over a given period of time all distances increase by the same factor. Note that this expansion only sets in beyond the local group of galaxies, e.g., beyond about a million parsecs or so...

Think of this. Suppose you could pick 2 doors. Your odds are 2/3. That is the same as the host necessarily picking an empty door if you switch doors.

Thanks for your reply. Interesting. Of course I was being facetious about photons point of view. I’m still learning how to use this forum which is quite interesting.

I will follow your advice in the future and will avoid metaphysical ideas which are untestable.

Okay, no more metaphysics here. The

What about branes? Is it really inconceivable that our universe is enveloped by a higher dimensional Spacetime? The problem is that we conceive of many strange ideas. Without observational or experimental data these concepts are almost invariably wrong.

I taught a course in general relativity and cosmology from 1970 until 2014 and have followed its progress closely. That was always my favorite course. My research was primarily on uv spectroscopy of interacting binary stars Using various spacecraft capabilities.

How do you describe a photon?

I always ponder on the fact that from a photon’s point of view it is already at its destination when it is emitted and hence never existed! I have no idea what that means if anything.

You are correct and I stand corrected.

Look up brane cosmology on Wikipedia for some sources.

Look it up. A geodesic is the SHORTEST distance between two points.

There are cosmologists and string theorists who would disagree. I know that either way is speculation. We really do not know.