Post AYR647eIMjBoRcuPUO by AlphaCephei@mastodontech.de
 (DIR) More posts by AlphaCephei@mastodontech.de
 (DIR) Post #AYQrhwQrzNvLvb9sdE by Revertron@zhub.link
       2023-08-05T20:58:17Z
       
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       You know, there is something strange about Dark Energy. Or I don't quite understand how it works (or why).Astrophysicists saw that galaxies are flying apart with some acceleration. So, they applied Second Newton's law (F = ma), and concluded, that there is some FORCE that is "pushing" those galaxies.But, on the other hand, we are catching photons that started their journey to us billions years ago because the SPACE itself is expanding.Maybe there is no force to begin with, but the expansion itself is causing those galaxies to accelerate? Or maybe it is some "property" of space itself, that it expands in absence of gravity (deep between galaxies, in the void)?#science #astrophysics #astronomy #physics #galaxy #space #cosmos
       
 (DIR) Post #AYQxy3V84i92D3DYYK by AlphaCephei@mastodontech.de
       2023-08-05T22:08:22Z
       
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       @Revertron But that IS exactly the standard explanation of #darkenergy , that it is an inherent property of space. Without Dark Energy, the expanding matter would pull space with it and slow down the expansion, with or without an eventual stop and rebound. But Dark Energy gives an extra push that overwhelms the mutual attraction of galaxies and makes them speed up. There is just no quantifiable explanation as to what effect causes this push. Vacuum energy is a candidate but 10^120 too strong...
       
 (DIR) Post #AYQzVs4dATzEZHVmZE by Revertron@zhub.link
       2023-08-05T22:25:49Z
       
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       @AlphaCephei But is there a real pushing? Or it is just stretching of space? 🤔
       
 (DIR) Post #AYR647eIMjBoRcuPUO by AlphaCephei@mastodontech.de
       2023-08-05T23:39:12Z
       
       0 likes, 1 repeats
       
       @Revertron Actually, it is an expansion of space, no actual pushing via F=m*a. Objects stay in place, but more space is created between them. Like a cake with raisins expanding while being baked. An object could actually slip over the expansion of space away from another object by just moving at the same speed that space grows between them in the opposite direction. Other forces and the required fine balancing neglected, it would keep the same distance forever with no propulsion required.