RE: Science Porn
June 26, 2017 at 8:50 am
(This post was last modified: June 26, 2017 at 8:56 am by Anomalocaris.)
(June 25, 2017 at 11:56 pm)vorlon13 Wrote: I found this under Great Attractor on Wiki. Does it seem familiar ??
The Great Attractor is a gravitational anomaly in intergalactic space at the center of the Laniakea Supercluster that reveals the existence of a localised concentration of mass tens of thousands of times more massive than the Milky Way. This mass is observable by its effect on the motion of galaxies and their associated clusters over a region hundreds of millions of light-years across. The Great Attractor is moving towards the Shapley Supercluster.[1]
These galaxies are all redshifted, in accordance with the Hubble Flow, indicating that they are receding relative to us and to each other, but the variations in their redshift are sufficient to reveal the existence of the anomaly. The variations in their redshifts are known as peculiar velocities, and cover a range from about +700 km/s to −700 km/s, depending on the angular deviation from the direction to the Great Attractor
No. The great attractor is still a local phenomenon, explicable by a local concentration of mass on the scale of hundreds of million light years. The phenomenon announced 4-5 years ago suggest the entire visible universe, all 13 billion observational light years in every direction, has a collective motion relative to CMB. Since any single source of gravitation formed after CMB would not have had enough time to make its gravity felt across the distance of entire visible universe, a gravitational explanation similar to the great attractor doesn't seem to work. A suggested explanation was the phenomenon is not the result of any present interaction, but instead a relic of a pre-inflationary interaction betweem what would become our visible universe, and something in another party of the universe that was pushed out of our observation horizon during inflation.