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Message: <blockquote data-quote="anamnlmslmn" data-source="post: 14873678" data-attributes="member: 453369">@Sataninhellඔයාගේ Surface of last scattering ගැන කියවන්න.<a href="http://map.gsfc.nasa.gov/universe/bb_tests_cmb.html" target="_blank">http://map.gsfc.nasa.gov/universe/bb_tests_cmb.html</a>The behavior of CMB photons moving through the early universe is analogous to the propagation of optical light through the Earth's atmosphere. Water droplets in a cloud are very effective at scattering light, while optical light moves freely through clear air. Thus, on a cloudy day, we can look through the air out towards the clouds, but can not see through the opaque clouds. Cosmologists studying the cosmic microwave background radiation can look through much of the universe back to when it was opaque: a view back to 380,000 years after the Big Bang. This “wall of light“ is called the surface of last scattering since it was the last time most of the CMB photons directly scattered off of matter. When we make maps of the temperature of the CMB, we are mapping this surface of last scattering.ඔය “cosmic microwave background radiation” (CMB) කියන්නේ big bang අවස්ථාවේ විකිරණය කියල ඔබ පිළිගෙන. එය microwave වන තරමට එය redshift වී ඇත. එය ඔබ පිළිගෙන. නැතිනම් පිලිගන්න වෙනවා. ඔය CMB දකිනවා කියන්නේ big bang අවස්ථාවේ දේවල් ආසන්න දේවල් දකිනවා වගේ තමයි. හේතුව, ආලෝකයේ වේගයෙන් එකල සිදුවූ දේවල විකිරණය/"ආලෝකය" දැනුයි ඇවිත් සේන්දු වෙන්නේ. එහෙනම් දැන් දකින CMB යනු එකල සිදුවූ දෙය දැකීමයි. එකල big bang එකට පසු opaque තත්වය දක්වා එය පේනවා. එම "සීමාව" ( “wall of light“) තමයි ඔබේ  surface of last scattering. ඒකෙන් කොහොමත්ම කියන්නේ නෑ universe එක expand වෙන්නේ නෑ කියල. ඔබ ඔය CMB එක පිළිගෙන තියෙන එකෙන්ම පේනවා expanding universe ඔබ පිළිගෙන ඇති බව. මෙහෙමත් පන්සිල් කඩාගෙන බොරු කියමින් කුරානය බොරු කරන්න තියෙන අවශ්‍යතාවය කුමක්ද? ඔබ එතරම්ම අසහනයෙන්ද? Check Mate වෙච්ච දුක නැති කරගන්න බොරු කියනවද? වැඩක් නෑ. ඒකෙන් වෙන්නේ ඔබේ දුක වැඩිවෙන එකයි.<a href="http://universeadventure.org/eras/era2-synthesis.htm" target="_blank">http://universeadventure.org/eras/era2-synthesis.htm</a>Once atoms formed, light and matter stopped constantly interacting with one another, and photons were suddenly able to travel freely. As a result, the Universe became transparent. Scientists refer to this epoch as the "Surface of Last Scattering;" light from this period is observed today as the CMB!හැමතැනම කියන්නේ ඒකමයි. <a href="http://en.wikipedia.org/wiki/Cosmic_microwave_background_radiation" target="_blank">http://en.wikipedia.org/wiki/Cosmic_microwave_background_radiation</a>The color temperature of the decoupled photons has continued to diminish ever since; now down to 2.7260 ± 0.0013 K,[3] their temperature will continue to drop as the universe expands. According to the Big Bang model, the radiation from the sky we measure today comes from a spherical surface called the surface of last scattering. This represents the set of locations in space at which the decoupling event is estimated to have occurred[18] and at a point in time such that the photons from that distance have just reached observers.විශ්වය ප්‍රසාරණය වෙනවා. ඔබේ surface of last scattering එක cmb දකින සීමාවයි.<a href="http://ned.ipac.caltech.edu/level5/Glossary/Essay_lss.html" target="_blank">http://ned.ipac.caltech.edu/level5/Glossary/Essay_lss.html</a>Imagine you are living 15 billion years ago. You would be surrounded by a very hot opaque plasma of electrons and protons. The Universe is expanding and cooling. When the Universe cools down below a critical temperature, the fog clears instantaneously everywhere. But you would not be able to see that it has cleared everywhere because, as you look into the far distance, you would be seeing into the opaque past of distant parts of the Universe. As the Universe continues to expand and cool you would be able to see farther, but you would always see the bright opaque fog in the distance, in the past. That bright fog is the surface of last scattering. It is the boundary between a transparent and an opaque universe and you can still see it today, 15 billion years later.පැහැදිලිවම විශ්වය ප්‍රසාරණය වෙනවා.  surface of last scattering යනු CMB පෙනෙන සීමාවයි. එච්චරයි.ඒකෙම, ඔයාගේ ගණිත හරඹයෙන් පෙන්නන්න හදපු දේ ගැන සරලව කියනවා.To visualise how this effect arises, imagine that you are in a large field filled with people screaming. You are screaming too. At some time t = 0 everyone stops screaming simultaneously. What will you hear? After 1 second you will still be able to hear the distant screaming of people more than 330 metres away (the speed of sound in air, vs, is about 330 m/s). After 3 seconds you will be able to hear distant screams from people more than 1 kilometre away (even though those distant people stopped screaming when you did). At any time t, assuming a suitably heightened sense of hearing, you will hear some faint screams, but the closest and loudest will be coming from people a distance vst away. This distance defines a `surface of last screaming' and this surface is receding from you at the speed of sound. Similarly, in a non-expanding universe, the surface of last scattering would recede from us at the speed of light. Since our Universe is expanding, the surface of last scattering is actually receding at about twice the speed of light. This leads to the paradoxical result that, on their way to us, photons are actually moving away from us until they reach regions of space that are receding at less than the speed of light. From then on they get closer to us.ඔයාගේ ගණිතය cmb එකේ නිරීක්ෂණයක් පැහැදිලි කරනවා මිසක් expanding universe එක කොහොමත් නිශේධනය වෙන්නේ නෑ. (Since our Universe is expanding, the surface of last scattering is actually receding at about twice the speed of light.). ඇයි මේ තරම් මුලාවකට යන්න ඔබට සිද්ධ වුනේ? එතරම්ම ඔබ අසහනයෙන්ද? නැතිනම් සත්‍යයට බයද?<a href="http://ned.ipac.caltech.edu/level5/March03/Lineweaver/Lineweaver7_2.html" target="_blank">http://ned.ipac.caltech.edu/level5/March03/Lineweaver/Lineweaver7_2.html</a>One of the most recent and most important advances in astronomy has been the discovery of hot and cold spots in the CMB based on data from the COBE satellite (Smoot et al. 1992). This discovery has been hailed as "Proof of the Big Bang" and the "Holy Grail of Cosmology" and elicited comments like: "If you're religious it's like looking at the face of God" (George Smoot) and "It's the greatest discovery of the century, if not of all time" (Stephen Hawking).වැලේ වැල් නැති අනාථයා ලිස්සපු, මුලාවේ සරණ පතන්නට තරම් හේතුවූ හිරවුන ප්‍රශ්නය තමයි...{{Universe එක Expand වෙනවද නැද්ද? වැල්වටාරම් බෑ.Universe එක Expand වෙනව කිව්වොත් කුරානය ඇත්තයි. නෑ කිව්වොත් බොරු කියල පන්සිල් කඩන්න වෙනව. මේක තමයි නියම හිරවිල්ල. මේකට ආයෙත් කියන්නෙ Check Mate කියල!<img src="/styles/default/xenforo/smilies/default/P.gif"  class="smilie" loading="lazy" alt=":P" title=":P    :P" data-shortname=":P" /><img src="/styles/default/xenforo/smilies/default/P.gif"  class="smilie" loading="lazy" alt=":P" title=":P    :P" data-shortname=":P" />  ඔයා නම් Check Mate පප්පෙක්!!! <img src="/styles/default/xenforo/smilies/default/lol.gif"  class="smilie" loading="lazy" alt=":lol:" title="LOL    :lol:" data-shortname=":lol:" /><img src="/styles/default/xenforo/smilies/default/lol.gif"  class="smilie" loading="lazy" alt=":lol:" title="LOL    :lol:" data-shortname=":lol:" />}} (පන්සිල් කඩන්නත් වෙලා..  පව් අනාථයා..)වැලේ වැල් නැති ඔබ දැන් එල්ලෙන්නේ කුමකද? <img src="/styles/default/xenforo/smilies/default/P.gif"  class="smilie" loading="lazy" alt=":P" title=":P    :P" data-shortname=":P" /></blockquote>

Verification: Nawa warak dahaya keeyada? (Namaya wadi kireema dahaya)

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