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Old 08-25-2011, 09:12 AM   #241
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cowmoo, reminds me of this I saw yesterday
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Old 08-26-2011, 09:28 AM   #242
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^Yeah I saw that, amazing.


Soooo, there's a river 13,000 feet below South America...
http://www.physorg.com/news/2011-08-...th-amazon.html
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Old 08-26-2011, 09:35 AM   #243
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Science themed I suppose. I really need to get into reading this thread.

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Old 08-26-2011, 10:56 AM   #244
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XKCD is an awesome comic! I always check them for new stuff...
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Old 08-26-2011, 11:15 AM   #245
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Someone posted that on reddit and unfortunately it's not possible. I died a little inside when I found out
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Old 08-26-2011, 11:18 AM   #246
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Someone posted that on reddit and unfortunately it's not possible. I died a little inside when I found out
Why wouldnt it be possible?
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Old 08-28-2011, 06:04 PM   #247
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Why wouldnt it be possible?
As of yet, we have no way of making a screen right in front of you look like it's far away


Came across this, more math related than science, but it's the golden spiral/fibonacci ratios in Irene
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Old 08-29-2011, 08:46 AM   #248
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I'm still trying to figure out what exactly I'm looking at here, but I'm pretty sure these are electron paths. The ones on the left are actual images (top is the highest orbital and bottom lowest) and the ones on the right are the mathematical models

http://news.sciencemag.org/scienceno...ntimately.html
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Old 08-29-2011, 09:33 AM   #249
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NASA folks talking about abandoning the ISS for now, considering we have no way to get there, and the Russian's keep blowing up Soyuz rockets. Sigh.
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Old 08-29-2011, 09:43 AM   #250
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Good thing Space-x has an insane number of job openings. I'm hopeful that privatizing the industry will push things forward a little quicker than in recent years.
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Old 08-29-2011, 09:45 AM   #251
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Would be nice if that was ready...
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Old 08-29-2011, 10:20 AM   #252
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Cowmoo.....I read something pertaining to hurricanes and fibonacci ratios a while back. Don't all hurricanes have similarities with the fibonacci sequence based on their rotation and shape?


I was sad to hear about the Soyuz rocket because even though there were no casualties (that I had read about), I was just waiting for NASA to say that they would no longer be flying with the Russians.
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Old 08-29-2011, 10:33 AM   #253
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There are 2 choices, fly with the Russians or don't fly at all. For the next several years. Terrible position to be in for the US.
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Old 08-29-2011, 10:36 AM   #254
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Cowmoo.....I read something pertaining to hurricanes and fibonacci ratios a while back. Don't all hurricanes have similarities with the fibonacci sequence based on their rotation and shape?
Hurricanes, galaxies, pineapples, trees, sunflowers, nautilus shells, you name it, if it's a natural process there's a solid chance you'll find evidence of the golden ratio; it's unbelievable. There's a great book with a super-creative title called The Golden Ratio that explains the history and ubiquitous nature of the number, really cool stuff.


slightly ot: click my signature, Tool incorporated fibonacci numbers into their song.
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Old 08-30-2011, 01:31 AM   #255
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awesome solar system 3d model
http://www.solarsystemscope.com/
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Old 08-30-2011, 01:33 AM   #256
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timelapse of milky way
******** src="http://player.vimeo.com/video/28040685?color=ffffff" width="400" height="225" frameborder="0">*********>

from Randy Halverson on Vimeo.

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Old 08-30-2011, 03:08 AM   #257
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this guy builds a map of his alternate universe
******** src="http://player.vimeo.com/video/6745866?title=0&byline=0&portrait=0" width="400" height="220" frameborder="0">*********>

from Jerry Gretzinger on Vimeo.

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Old 08-30-2011, 08:01 PM   #258
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Came in to post the timelapse you posted up there but holy sh!t this is awesome. Loved it. The world is missing out if his work isn't put into a museum some day. I can see myself spending hours exploring his work. Maybe I should start an art thread...
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this guy builds a map of his alternate universe
******** src="http://player.vimeo.com/video/6745866?title=0&byline=0&portrait=0" width="400" height="220" frameborder="0">*********>

from Jerry Gretzinger on Vimeo.

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Old 08-31-2011, 01:02 AM   #259
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Supercomputer takes 9 months to create a simulation of Milky Way
http://cosmiclog.msnbc.msn.com/_news...axy-re-created


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How long does it take to simulate the Milky Way? The answer is about nine months, if you're using a powerful supercomputer. That's how long it took for researchers at the University of California at Santa Cruz and the Institute for Theoretical Physics in Zurich to produce the first simulation of galaxy formation that approximates the look of our own Milky Way spiral.

"Previous efforts to form a massive disk galaxy like the Milky Way had failed, because the simulated galaxies ended up with huge central bulges compared to the size of the disk," Javiera Guedes said today in a news release about the project.

Guedes worked on the project during her time at UC-Santa Cruz, and is now a postdoctoral researcher at the Swiss Federal Institute of Technology. She's the first author of a paper accepted for publication in the Astrophysical Journal that describes the simulation, known as the Eris galaxy.

For 20 years, astronomers have been trying to come up with a simulated galaxy that comes close to the look of the Milky Way and other spiral galaxies - but fell short of the mark. Guedes and her colleagues were more successful in part because of the computer firepower at their disposal: 1.4 million processor-hours on NASA's Pleiades supercomputer, plus additional supporting simulations at UC-Santa Cruz and the Swiss National Supercomputing Center.

"We took some risk spending a huge amount of supercomputer time to simulate a single galaxy with extra-high resolution," said UC-Santa Cruz astronomer Piero Madau, one of the paper's co-authors.

The effort used a software platform known as Gasoline to trace the motions of more than 60 million particles, representing galactic gas as well as dark matter, over the course of more than 13 billion years.

Madau said developing a realistic simulation of star formation was another key to Eris' success.

"Star formation in real galaxies occurs in a clustered fashion, and to reproduce that out of a cosmological simulation is hard," he said. "This is the first simulation that is able to resolve the high-density clouds of gas where star formation occurs, and the result is a Milky Way type of galaxy with a small bulge and a big disk."

The recipe for the Eris galaxy limited star formation to the high-density regions of the galactic disk, which resulted in a more realistic distribution of stars. Within the high-density regions, supernova explosions powered an outflow of gas from the inner part of the galaxy, keeping the central bulge from getting too big.

The point of the exercise wasn't merely to come up with a pretty animation. The virtual conditions for Eris' creation are consistent with the theory that galaxy-scale structures coalesced from cosmic webs that were dominated by cold dark matter. Gravity drew primordial clumps of dark matter together into bigger clumps, and the "ordinary" matter that makes up stars and galaxies fell into those dark-matter clumps - giving rise to visible galaxies embedded in halos of invisible dark matter.

Cosmologists contend that the universe consists of 4.6 percent ordinary matter, 23.3 percent dark matter and 72.1 percent dark energy. But the fact that astronomers found it difficult to produce galaxies like the Milky Way using that formula led some to question the prevailing cosmological model of the universe. The Eris galaxy simulation "shows that the cold dark matter scenario, where dark matter provides the scaffolding for galaxy formation, is able to generate realistic disk-dominated galaxies," Madau said.

The research team's effort may be a tour de force for supercomputing, but don't confuse the virtual Eris with the real-life Milky Way. Even though Eris is an incredibly high-resolution simulation, its 60 million particles of gas and dark matter pale in comparison with the Milky Way's hundreds of billions of stars.

Swiss researcher Lucio Mayer discusses the galaxy formation simulation with interviewer Michele De Lorenzi.

Extra credit: Eris is named after the Greek goddess of discord, in recognition of the decades of discordant debate that have surrounded the scenarios for forming spiral galaxies, according to a description of the project on the HPC-CH weblog. Guedes' website includes a quote from the Iliad: "The soldiers fought like wolves while Eris, the Lady of Sorrow, watched with pleasure." The simulated galaxy isn't the first astronomy-related object to bear that discordant name: Eris is also the name given to the dwarf planet that caused so much trouble for Pluto.
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Old 09-02-2011, 02:02 PM   #260
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Solar eclipse from MIR
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