RE: Questions about Time, Distance, and Relativity
November 11, 2014 at 10:18 am
(This post was last modified: November 11, 2014 at 10:27 am by Alex K.)
If you feel like doing simple maths, you can take the distance between, say your two hands stretched out, and simply multiply it by the current Hubble "constant". You then get a velocity out of it which is the velocity at which your hands would move apart due to universal expansion if they were not bound by electromagnetic forces. Youll find that it is a mind bogglingly small speed. You can then repeat the exercise with the andromeda galaxy and the milky way. You should find that now, it is a more significant relative speed which needs to be counteracted by relative motion of the galaxies themselves e.g. due to their gravitational attraction... The hardest part in the calculation is converting parsecs to meters.
(November 10, 2014 at 4:10 pm)Pickup_shonuff Wrote: Ok..few more...for now...
Considering the balloon analogy, how can galaxies collide if the space BETWEEN them is expanding?
Why is it that we don't actually experience the expansion of space? Is it because of the gravitational field? As in... it keep us "bounded" to this particular bodily composition, in terms of persons, planets, solar systems, galaxies, superclusters, etc.?
I understand Krauss to be arguing something to the effect that space must RESULT from fluctuations in the quantum gravitational field... but isn't this "quantum foam" itself an ultra-microscopic region of space? Doesn't he just mean that space can be inflated and produce matter from prior energy?
The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition
