Recent content by Paul Howard A

That makes a lot of sense. Thank you.

Basic stuff. Do emission and absorption spectra match? If so, why wouldn't hot stellar atmospheres exhibit both, cancelling? I'm a tourist...not physics minded..

The point I've been hinting at is pretty basic but remains mysterious to me. If the fabric of space is expanding everywhere, and all "bound" systems remain the same dimensions, then the components of those systems must be gaining energy (kinetic?) as they "fall" through the expanding space to...

Peter. This is not a peer review or textbook reference, but I believe Fraser Cain is respected in your field: https://www.universetoday.com/107142/is-everything-in-the-universe-expanding/ His words: "As space expands, it carries galaxies away from each other. From our perspective, we see...

All good stuff, thank you. But I sense that this forum underestimates the depth of my ignorance. Perhaps my original query was too naïve. I'm not so much interested in the behavior of bodies in a static space, but the thermodynamic consequences of bodies in a dynamic space.

Khashishi, Thank you for your clarification. You state above that "SPACE" would contract if gravity overcame the original expansion? I have understood that space is warped by the massive bodies within it, but it never occurred to me that space, itself would contract to a singularity in a "Big...

I’m getting a bit more educated and now I think I know where to look for greater insight. Thnx

Very informative, and thank you. But my question really had more to do with the effects of expanding space on thermodynamics at a local level. If space were, indeed, “trying” to expand the distance between particles and planets, then could we not expect an increase in the kinetic energy of the...

Sorry to be a pest. But it sounds like there are differing explanations for each scale?

...and the space BETWEEN bonded atoms in molecules and metals and plasmas etc?

But I’m told that atoms are 99.999999999999% empty space and that there are 1 X 10 to the 80’th power atoms...

kimbid, Thank you for your patience with my naive assumptions. I’ve had trouble finding a good reference on this. What about all the space inside atoms?

I was thinking about the expansion of space. It seems clear that objects that are bound by gravitation or the strong nuclear force do not experience an increase in size as the universe continues it's expansion. However, such systems do contain abundant space. It is argued that gravitation and...

And to hopefully conclude my befuddlement: It is further argued that gravity and the strong nuclear force "overcome" the expansion of space within their systems. If these forces must "overcome" the expansion, then wouldn't their respective forces diminished? Which in a flexible system would...

I was thinking about the expansion of space. It is argued that things that are bound by gravitation or the strong nuclear force do not experience and increase in size. However, if such systems are flexible (and gravitationally bound systems clearly are) then, shouldn't the expansion of space...