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Expansion of the Universe
At what speed is the Universe currently expanding?
I'm just doing this for my OU course, I worked it out to 61.3 km/ s/Mpc. The accepted value is around 60 but anywhere between 40 and 100 may be right !! That is, assuming we are expanding from the point where The Big Bang occurred No, everything is zooming away from everything else, there is no " point of origin" weird. Also c is still a constant, things do not exceed c, ...ever...! (except on Star Trek) :-)) jc --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.514 / Virus Database: 312 - Release Date: 28/08/2003 |
#2
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John Carruthers wrote:
At what speed is the Universe currently expanding? I'm just doing this for my OU course, I worked it out to 61.3 km/ s/Mpc. The accepted value is around 60 but anywhere between 40 and 100 may be right !! That is, assuming we are expanding from the point where The Big Bang occurred No, everything is zooming away from everything else, there is no " point of origin" weird. Also c is still a constant, things do not exceed c, ...ever...! expansion does and (except on Star Trek) :-)) of course. jc --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.514 / Virus Database: 312 - Release Date: 28/08/2003 |
#3
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John The expansion rate of space is accelerating from our point of red
shifting view in all directions from us. That gives us the feeling we are at the center(this could not be reality) Astronomers seeing the red shift getting redder and redder say it is accelerating faster and faster. To accelerate continually needs a continual force.(like gravity) That is another one of natures mysteries. I have one theory space goes from concave to convex(Einstien would like that) or that matter,and anti-matter are annihilating each other at a distance of 13 billion LY from us. My last idea has continual (once a day) mini-bangs taking place also very far from us is creating this space energy of accelerating expansion. John take your pick. I'm laughing I just thought of another way. Bert |
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"John Carruthers" wrote in message
... At what speed is the Universe currently expanding? I'm just doing this for my OU course, I worked it out to 61.3 km/ s/Mpc. The accepted value is around 60 but anywhere between 40 and 100 may be right !! These days things are a little more stringent than that: http://scienceworld.wolfram.com/phys...eConstant.html That is, assuming we are expanding from the point where The Big Bang occurred No, everything is zooming away from everything else, there is no " point of origin" weird. Also c is still a constant, things do not exceed c, ...ever...! (except on Star Trek) :-)) jc Widely separated regions of space, and their contents, can be moving at relative velocities greater than c. This is due to the expansion of space itself with intervening space being created, the overall effect being that the distance between far apart regions is growing at a rate that is faster than light can cover in the same time. This is the reason why we have a cosmic horizon, from beyond which light cannot reach us. Note that this does not contradict relativity and the notion that the *local* speed of light cannot exceed c. |
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It was Doppler that told us the change of frequency of sound let you
know if the object was coming towards you or away. Now we think of Hubble next using red,and blue to show if an object is coming at us or away. This is not true it was to guys named Huggins,and Fizeau. In 1869 Huggins figured out that Sirius was moving away from Earth at 20 miles a second. Hubble came into the picture when he picked up on this and applied it to galaxies,and he told us galaxies got redder,and redder they increased their speed away from us with distance. In other words, the universe was expanding. Hubble got a Nobel Bert |
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