Post AXUpKEa75X80ZzkwwC by Revertron@zhub.link
 (DIR) More posts by Revertron@zhub.link
 (DIR) Post #AXUmuQweIaO5UErnZA by Revertron@zhub.link
       2023-07-08T20:31:11Z
       
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       I love watching shows of Neil deGrasse Tyson, Brian Cox and others on #astronomy. And I think, that I understand most of the concepts. But there is something very simple, that eludes me.Webb telescope now looks very far into the past of our universe. About 13.5 billon years, where were the first galaxies formed.We see it by capturing the photons that are flying towards us all those billion years, am I right?But the question is - how did WE get here before them??? Some very big chunk of matter, our galaxy, somehow got here before them, and we even had those 4.5 billion years to condense it to Solar system, created those first replicators, made them into biological forms, and even "invented" our intelligence to comprehend that cosmology.But those photons are still flying...Is there expansion of our universe involved?And the second question: WHERE is the Webb looking? Where are those first galaxies?All around us? Or in some old "universe center"?#cosmology #astronomy #webb #darkmatter
       
 (DIR) Post #AXUoTjBQa4Jm8qAm3M by Lafiel@my.elven.pw
       2023-07-08T20:43:53Z
       
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       @Revertron А что если за пределами солнечной системы действуют другие законы физики и свет движется намного быстрее. Тогда мы наблюдаем происходящие события практически в реальном времени.
       
 (DIR) Post #AXUoTk69BBgiyki4Se by Revertron@zhub.link
       2023-07-08T20:48:54Z
       
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       @Lafiel Ну не, я убеждён, что мы не можем так ошибаться.
       
 (DIR) Post #AXUocniV5whgo9y7d2 by AlphaCephei@mastodontech.de
       2023-07-08T20:50:22Z
       
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       @Revertron Absolutely right. The big bang happened everywhere at the same time and space has been expanding ever since. The speed of expansion depends on the distance. Some galaxies are so far away that space grows faster than light between us and them. Light needs to travel through the expanding space to reach us - like an ant crawling between 2 points on a balloon while it is inflated. That's why it takes so long to reach us although the galaxies were 10-20x closer when they emitted that light
       
 (DIR) Post #AXUpKDwlRpeWbxLWbY by AlphaCephei@mastodontech.de
       2023-07-08T20:55:16Z
       
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       @Revertron Where these galaxies are: all around us. When we look into the distance, we look into the past. Space expands with equal speed in all directions, so equal distance means equal lookback time. The big bang happened everywhere, so you would see it all around you, if you could - but we can only "see" (with radio telescopes) up to the cosmic microwave background, basically the fireball of the big bang that became eventually transparent so light could travel in straight lines afterwards.
       
 (DIR) Post #AXUpKEa75X80ZzkwwC by Revertron@zhub.link
       2023-07-08T20:58:24Z
       
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       @AlphaCephei Thanks for explaining! It makes sense :)
       
 (DIR) Post #AXWN5zLSWzLWs1EyNU by redshiftdrift@astrodon.social
       2023-07-09T14:51:24Z
       
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       @Revertron It's not a race between us and the photons since we are not moving!  The galaxy that emitted the photons is not moving either!However *space* between the galaxy and us is stretching very rapidly, so fast that the photons have a hard time catching up with the fast #Space #Expansion of the #Universe in the past.Photons are like this fast guy catching up with people who are *standing* on the 'up escalator' 🔗 https://youtu.be/rAI9Jp8mh2UWhy not ask deGrasse Tyson and Cox?