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  1. It is a tough one, there seem to be no articles on it, and if it would actualyl occur at all in a balanced universe
  2. Thank for this George, it would explain when the baryons would disappear, also if I was to pose another question, still in the same universe with no imbalance, what time would the last scattering of photons be, I can not be as simple as when the earth is no longer hot enough to ionize matter? or maybe it is that simple I am interested in your thoughts.
  3. Hi George thanks for showing an interest in my topic, the article i was reading can be found here https://arxiv.org/pdf/1801.10059.pdf. So sorry if i am wrong, but what you are saying is In a universe where there is no imbalance of matter and antimatter, then there would be continued collisions until expansion was great enough that they could no longer collide? causing less and less baryons to be present?
  4. I read a interesting article the other day based on the a symmetry between matter and antimatter and how it is the key to the existence of our universe(i have the article link if anybody wishes to read it),It got me thinking what it would be like it should have after the big bang there was no imbalance between matter and antimatter and i began to wonder at what time would baryons disappear if there was no imbalance, but i have been unable to either think or find no research, or even if there has been any research done. Any thoughts on the subject i would greatly appreciate. Thanks.
  5. Great picture Fozzie. Have you ever tried to calculate the diameter of an Einstein ring?
  6. Hi, The Velocity Dispersion is a mean of the velocity of a group of objects, given a range of redshifts ie z = 0.12 and z = 0.125 and an average redshift of z = 0.122. Am I correct in saying that to calculate the velocity dispersion, using Hubbles law to calculate the velocity of each red shift and simply taking the mean number of the 3 would infact give me the velocity dispersion? Seems too simple for me, but I know they said just because its simple doesn't mean it is incorrect.
  7. Hey this has been really good, id like to add a little more to the discussion and that would be how from the redshift data obtained we can determine the apparent recession speed, was just something my friend said to me earlier but we was not sure, as we need that recession speed to calculate the distance to the galaxy. We thought that maybe redshift is used the determine the recession speed. Redshift = (λobs-λrest)/λrest. But we were both a little unsure how we would calculate the speed from this
  8. So put into practice its is Vr = (λobs-λrest)*300000/λrest = speed Just want to make sure I get the formula written down correctly That is great thanks mikey I appreciate the help
  9. Thanks mikey with the risk of sounded silly, where did the 6.1 come from? and your way you would not come across a negative value such as I have when calculating the 494.2nm
  10. Thanks so much for replies this I what I had before I posted My thoughts were, as the rest wavelength is 486.1nm and both observed wavelengths were 492.6nm and 494.2nm this shows the stars moving away so (Red Shift). So this took me to using the equation vr = c(1 − λ/λr) so to substitute the numbers into that would give me vr = (300000 km/s)*(1-486.1/494.2) this equals vr = 300000*(1-0.98)km/s = and here is where I get 6000km/s and this does not seem correct I noticed a mistake so I made an edit to this
  11. Hi, when doing some studies I have come up with a problem I was wondering if anybody could help. The spectra of stars at one edge of the galaxy are observed at a wavelength of 492.2nm while the same line seen in the spectra of stars at the opposite edge of the galaxy are observed at a wavelength of 494.2nm. Given the rest wavelength is 486.1nm calculate the speed of the stars at the two edges with respect to a observer from Earth. Now I understand Doppler shift, redshift and blueshift, I am just not sure how to put them into practice to calculate the speed here. Any help
  12. Hi I am trying to answer the question of if a cloud was to contract, then what observational evidence would suggest it would fragment to form many Prostars of low mass? I can not seem to find any information online to help me I was wondering if anybody here had any suggestions? I look forward to reading them.
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