submitted by /u/Competitive_Travel16 [visit reddit] [comments ..read more

submitted by /u/Kalaher [visit reddit] [comments ..read more

Cowmic rays, similarly to ordinary photons, get "redshifted" as they travel through the expanding universe. Photons do redshift to lower frecuencies losing energy and "temperature" in the process. Meanwhile, cosmic rays lose momentum and thus velocity, so in that sense they are kind of redshifted as the universe expands. However, why do they redshift? I've read that cosmic rays lose energy overtime by interacting with photon fields like the CMB. Is it because of this? submitted by /u/stifenahokinga [visit reddit] [comments ..read more

submitted by /u/Competitive_Travel16 [visit reddit] [comments ..read more

I have always been interested in multiple perspectives and ideas in regards in personal theoretical astrophysics and cosmology as the variety of hypothesis leaves a lot to learn, if you have a theory that hasn't been established but would like to explain I would be interested as I believe all perspectives have value, explaining the reasoning or observation that lead to you to your conclusions makes it easier to understand any concepts I made not be personally familiar with. submitted by /u/Legitimate_Owl_7544 [visit reddit] [comments ..read more

It seems to me that all alien life that exists must have some non-interference rule like the prime directive in Star Trek. Here's why: Very unlikely that we're the first intelligent life in the galaxy. In fact very unlikely that there's not multiple sets of intelligent life that have sprung up before us and don't have the entire galaxy and all potentially habitable planets mapped. If another alien species was aware of our existence and was hostile, it would seem very unlikely that they just haven't gotten to us yet. Possible, but with 1,000s, 10,000s or millions of years headstart, I think t ..read more

Take Einstein’s 1917 spherical finite static universe & adjust it to fit the Big Bang paradigm. All the energy created by BB is flung out, by Dark Energy, in the shape of a rapidly expanding shell. The two sides of the shell expand away from each other faster than light, thus are not gravitationally linked. Thus the gravity or curvature of space time is determined only by the LOCAL shell. Einstein’s universe had a 3D hypersphere as its surface, in this model BOTH sides of the shell width are a 3D hypersphere. This means that on both sides of the shell width ALL light geodesics CURVE BACK ..read more

My understanding is that during Big Bang Nucleosynthesis, matter and antimatter was created in almost equal amounts. This has oft lead to questions about what happened to all the antimatter, as it certainly isn't around today. As I understand, during Nucleosynthesis, matter and antimatter was being created from the abundant radiation energy, which in my mind would consist of something like ultra-high energy photons and other particles. Matter and antimatter is created from radiation, with most of it immediately annihilating and turning back into radiation. This would create a temporary system ..read more

I’m an engineering major trying to learn about cosmology and astronomy more as it always intrigued me . I’ve not particularly studied or taken any course on it but I wanna learn more about it but not indulge much in the mathematics of it and mostly the theoretical aspects to read as a hobby ! Any book suggestions or courses I could take as a hobby? submitted by /u/Luviejn [visit reddit] [comments ..read more

I’m interested in learning more about astronomy and cosmology. Does anyone know of any free education or maybe free online courses I could take? submitted by /u/KnuckleHead0911 [visit reddit] [comments ..read more