- #1
PaulS1950
- 151
- 0
Please forgive my ignorance but:
I am trying very hard to understand how expanding space works.
The problems I have are:
1. If expanding space has enough "connection" (friction?) to pull galaxies apart then it should also have a resistance to planets in orbit, rockets continuing on their course after the engines quit firing, and all related free movement in space. (ballon example doesn't work - the dots are connected to the balloon and galaxies are free in space)
2. "Red shift" and "time dilation" (perceived) is used to anchor this theory but can't that same red shift and time dilation be explained by the different densities of particles in the space between those great distances?
When light goes through different media it can slow or lose energy. Could this cause the effects that we are measuring? If not why not?
Keep in mind that I am just a 60 year old man trying to understand this. I have spent time looking at many different pages professing to explain this in "laymen's" terms but none of them address these two points. I don't believe in "tired light" as it is called but it may be part of the process in some way - photons do have mass as they are affected by gravity. As I understand it they have the same mass as an electron. If photons don't have mass then why are they affected by gravity - as in gravitational lensing?
Ok, I have probably shown my complete ignorance here but I want very much to understand this whole process, so please be gentle and try to explain in language that a layman can understand.
I will continue to check out reputable sites so if you can recommend any that use language that I can understand I would be eager to read them.
I am not afraid of math but do not have education in anything higher than pre-trig... a handicap that I admit.
Thank you,
Paul
I am trying very hard to understand how expanding space works.
The problems I have are:
1. If expanding space has enough "connection" (friction?) to pull galaxies apart then it should also have a resistance to planets in orbit, rockets continuing on their course after the engines quit firing, and all related free movement in space. (ballon example doesn't work - the dots are connected to the balloon and galaxies are free in space)
2. "Red shift" and "time dilation" (perceived) is used to anchor this theory but can't that same red shift and time dilation be explained by the different densities of particles in the space between those great distances?
When light goes through different media it can slow or lose energy. Could this cause the effects that we are measuring? If not why not?
Keep in mind that I am just a 60 year old man trying to understand this. I have spent time looking at many different pages professing to explain this in "laymen's" terms but none of them address these two points. I don't believe in "tired light" as it is called but it may be part of the process in some way - photons do have mass as they are affected by gravity. As I understand it they have the same mass as an electron. If photons don't have mass then why are they affected by gravity - as in gravitational lensing?
Ok, I have probably shown my complete ignorance here but I want very much to understand this whole process, so please be gentle and try to explain in language that a layman can understand.
I will continue to check out reputable sites so if you can recommend any that use language that I can understand I would be eager to read them.
I am not afraid of math but do not have education in anything higher than pre-trig... a handicap that I admit.
Thank you,
Paul