Recent content by aboro

Clalnoth, does this mean that from B's perspective, he thinks his flashlight does not work because it emits no light? Given your answer, am I right in assuming that A does not see the beam of light at all and that from his (A's) perspective, B and his bike will strike the wall at the same time...

I am trying to understand in non-mathematical terms the meaning and physical reality posed by Einstein’s law which tells us that the speed of light is the same relative to all observers. I start with a basic hypothetical: Observer A observes B riding a motorcycle that is traveling at 50 mph...

If I understand you correctly, you are saying that dark energy is not the cause of the expansion of the Universe. Inertia is. If our galaxy no longer has to compete with the force of the Universe's inertia because that force was overcome long ago, is it still correct to say that this force...

My understanding about the expansion of the Universe is that it is observed when assessed at great distances (as between two galaxies) and that the cause of the expansion in unknown although the consensus is that dark energy may be the force that is causing galaxies to repel from each other. How...

With all of our technology, we know that the the distance between the Earth and the moon is 298,900 miles. If that distance is increasing because the Universe is expanding, is it taking light a longer amount of time to travel from the Earth to the moon or has the light red-shifted as compared...

Chalnoth, I do not understand the basis for your answer (or perhaps the question that has been asked): I thought there is a distinction between the expansion of space between galaxies and over great distances as compared to what is happening locally. Thus, there is no expansion occurring...

A great way to explain this visually!

Chronos - - you have a great way of explaining difficult concepts regarding cosmology in simple terms to a layman.

But all of this did not have a beginning in the form of an "explosion" or as a tiny dot (hence the use of the word "singularity"). The words "explosion" and "singularity" are entirely too misleading in describing what cosmologists think actually occurred and which we are witnessing today via...

Phinds, unfortunately for the profession of cosmology and to the surprise and disappoint of many layman, like me, it appears that cosmologists themselves are responsible for the "misunderstanding' by misdescribing cosmological events such as the Big Bang and the Singularity. For example, just...

I just did. Thanks for calling it to my attention. This subject is drop-dead interesting.

Drakkith, though what you say in response to Reed's query makes sense (at least for me), on what basis, thereflore, are we able to say anything regarding events and objects that are greater than 13.5 Gly away given that the light generated from those objects are beyond our ability to detect?

Drakkith, please ignore my query in post # 16. You answered that question in post # 13.

-- Cepheid, it seems to me that Reed's comment (which I also share) begins to make sense only if we take into account the creation of new space that is forming between two distant objects such that the laws of motion and light speed are valid for conditions existing in or near that object but...