Recent content by Hans Nelsen

I found Brian Powell's Inflationary Misconceptions and the Basics of Cosmological Horizons, Aug. 28, 2015, PF Insights, helped quite a bit to get my head around these ideas. I'm not quite sure how badly it may try the patience of physicists to explain to us boneheads a bit about the meaning of...

I would be very interested to learn something about the scale at which the expansion of the universe can be measured. Our galaxy is not expanding, correct? Gravity holds local objects in their current relationships? Is it the space between galaxies that is growing? at what rate? Presumably all...

Little typo there: presumably we are not becoming farther from local objects on the scale of the galaxy

On what scale is the expansion of the universe observable? Presumably we are not farther from local objects on the scale of our galaxy. Is the distance between galaxies observably greater over a given time period, and is it possible to say how much? Presumably, there is no center, all points...

Hello to all

Since more distant objects are older, and the farthest objects we receive light from are billions of years old, or rather, their light is billions of years old, in what way, or how different would the distant universe be, if we could see the light it generates today? For that matter does light...