Is There Evidence for the Universe's Expansion and a Constant Speed of Light?

[Drmarshall]

Every atom in the universe is 99.99% space.
So if space were "expanding" (compared to what!) every atom in my metre rule would be expanding. So there is no MEASURABLE expansion

Where is the EVIDENCE that the speed of light has "stayed constant" over the past 15 billion years. Compared to what?

 

[Chronos]

Variable speed of light theories persist to this day, despite the lack of unambiguous evidence in support of the idea. It is, at best, viewed as highly speculative.

 

[phinds]

The universe CANNOT expand

Uh ... really ?


When you come up against something that flies so utterly in the face of established science, it is not a good idea to start off reaching different conclusions and stating them as correct but rather to start off with the assumption that you have made a mistake somewhere and try to find out where it is. If you have NOT made a mistake you will find the flaw in the established science, but that is very unlikely to happen. If you start off thinking that you have overturned established science you are likely to just end up embarrassed.

 

[Vanadium 50]

This is not a valid thread start.

Asking questions is OK, but making a bunch of incorrect statements in the hope of learning that way is not. It's both inefficient and annoying.

 

[sardar]

I understand the concept of the expansion of the universe and the evidence that supports it. The statement that the universe cannot expand because every atom is mostly space is not entirely accurate. While it is true that atoms are mostly empty space, it is the space between atoms that is expanding, not the atoms themselves. This expansion is measured by looking at the distances between galaxies, not individual atoms.

The evidence for the constant speed of light over the past 15 billion years comes from various observations and experiments, such as the study of cosmic microwave background radiation and the measurement of the redshift of distant objects. These studies have consistently shown that the speed of light has remained constant over time and space. Additionally, the theories of general and special relativity also support the notion of a constant speed of light.

It is important to note that the concept of the expansion of the universe is not something that can be measured with a ruler or meter stick. It is a phenomenon that is observed and studied through various scientific methods and technologies. The evidence for the expansion of the universe is based on observations and data from a variety of sources, and it is constantly being refined and updated as our understanding of the universe grows.

In summary, as a scientist, I can confidently say that there is ample evidence to support the expansion of the universe and the constant speed of light. These concepts have been extensively studied and validated by numerous experiments and observations. While it may seem counterintuitive, the expansion of the universe is a well-supported and accepted scientific theory.