Recent content by shemszot

Hello Wallace, Marcus, Thanks for the insight. I actually never thought the universe had an edge.. I was trying to play a devil's advocate to the big-bang theory as I understood it. Apparently I totally mis-understood it! I though that because scientists were giving the universe an 'age' and...

Hi Marcus, I appreciate your answers and like how you answered with 'due respect' :). As such, can you point me to a 'Cosmology for Dummies book', or a 'Cosmology for Dummies' thread? I would like to understand how cosmologists can justify a universe with no end, which initiated from a...

I agree, a system of sticky threads that everyone should read before being able to post is a very good idea (at least within a category of interest - such as cosmology. Further, I don't want to ask questions which I am sure have been answered before, however I haven't seen anything discussing...

Even if gravity travels at a finite speed, it would still be affected by space-time expansion, (If a particle can get to the edge of a universe in time t, so can gravity) and as such being at the edge of the universe you should still experience the effects of gravity, even for a particle which...

Hi Wallace, even if we assume the early universe was homogeneous, then all the matter contained within that universe would have still had a center, and as such it would have to have a center of gravity, and as such without space time expansion it would have fallen onto itself.

Hello Yogi, I think the concept of space time expansion states that during the early universe the Hubble Constant - which is not actually a constant, but a constant varying with matter-energy density [Capital Omega] was VERY HIGH. The Hubble Constant was multiple magnitudes higher then the...

Thank you the explanation, I think I understand this concept, however I'm not sure I totally buy this explanation.

To answer the first question: Time can exist without matter. Why? because time measures change, and you can measure change in things that are non material in nature such a photos. The alternative question to ask would be, 'Can time exist without matter or energy' in which case my answer...

It's all a question of quantities. I don't suspect the universe is significantly ionized, however I don't see any proof to suggest that the universe is completely balanced either. If there was a very insignificant number of charged particles of one type which would be more common in the...

Just out of interest.. Is there a theory that states that the universe is electrically neutral?

Hello, I'm wondering, how could the universe continue to expend directly after the big bang considering the total amount of mass confined to the relatively small space. As an example consider that it takes 8 minutes for light to travel from the sun to earth. If at the beginning of time someone...

The answer looks right. An alternative way of solving this question (to check your answer) would be to just ask what is the centripetal acceleration of Earth around the sun, given the sun's gravitation force at our distance. acceleration=G*m1/r(2) G=gravitational constant=6.67E-11...