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A Video Map of Motions in the Nearby Universe
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| gnlaera | Date: Sunday, 11.08.2013, 17:22 | Message # 1 |
 Observer
Group: Newbies
Brazil
Messages: 7
Status: Offline
| Hello everyone,
This is my first post in this forum. I would like to share with you all this amazing Big Picture of what we call Universe:
http://irfu.cea.fr/cosmography
http://vimeo.com/66641648
Hope you like it! 
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| HarbingerDawn | Date: Monday, 12.08.2013, 00:09 | Message # 2 |
 Cosmic Curator
Group: Administrators
United States
Messages: 8717
Status: Offline
| This should have been posted in the Science and Astronomy section.
All forum users, please read this!
My SE mods and addons
Phenom II X6 1090T 3.2 GHz, 16 GB DDR3 RAM, GTX 970 3584 MB VRAM
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| Salvo | Date: Monday, 12.08.2013, 10:17 | Message # 3 |
 Star Engineer
Group: Local Moderators
Italy
Messages: 1400
Status: Offline
| She's definitely french.
The universe is not required to be in perfect harmony with human ambition.
CPU: Intel Core i7 4770 GPU: ASUS Radeon R9 270 RAM: 8 GBs
(still don't know why everyone is doing this...)
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| gnlaera | Date: Tuesday, 13.08.2013, 01:51 | Message # 4 |
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Observer
Group: Newbies
Brazil
Messages: 7
Status: Offline
| Thanks for moving it and sorry for the inconvenience!
Anyone watched it? Any impression? Am I the only touched by this amazing hypothesis of our litlle insignificant planet and galaxy being part somehow of a huge intergalatic dance ?! 
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| Watsisname | Date: Tuesday, 13.08.2013, 03:55 | Message # 5 |
 Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| I was only able to load/watch about the first half of it, but from what I saw it was really neat. Good presentation.
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| gnlaera | Date: Tuesday, 13.08.2013, 15:05 | Message # 6 |
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Observer
Group: Newbies
Brazil
Messages: 7
Status: Offline
| Yes, it is a quite neat presentation.
One question I still have left in my head is if these guys (who are specialists in the field), when running models like those which aim to predict movement patterns for the galaxies, do adjust the positions to the time lag for the light of these bodies to reach us or not.
Maybe I am saying something very wrong but I understand that given the huge distances between galaxies, this variable can be quite significant in the building of a model with such objectives. Am I wrong?
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| Watsisname | Date: Wednesday, 14.08.2013, 02:21 | Message # 7 |
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Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| I'm not sure without looking at their paper, but I doubt it would be too important. Typical velocities of galaxies through space (referred to as 'peculiar velocities' -- this is different than the recession velocity which is an artifact of universal expansion) are up to about 500 km/s (the fastest appears to be Abell 3653 at 700 +/- 100). That translates to only a thousand or so light years of position error per million light years of distance, which isn't too terrible. Even at a billion light years you'd be off by only a few galactic diameters.
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| gnlaera | Date: Wednesday, 14.08.2013, 02:32 | Message # 8 |
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Observer
Group: Newbies
Brazil
Messages: 7
Status: Offline
| Interesting considerations Watsisname! This is indeed impressive to me!
Do you think these guys are the first to map possible motion patterns of galaxies like these?
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| Watsisname | Date: Wednesday, 14.08.2013, 05:39 | Message # 9 |
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Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| I'm not entirely sure! I know a lot of people have done modeling -- basically building a cluster of galaxies in a computer, giving them some random velocities, then running the simulation and watching what happens. A few really impressive simulations have been done on enormous scales, simulating the evolution of galactic clusters and superclusters right out of the Big Bang. But as for making a visualization of the actual motions of galaxies from observations, that's the first time I've seen it done.
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