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The attached image uses data from the "6dF Galaxy Survey"
at http://www.aao.gov.au/local/www/6df/ to visualize our
closest neighbours up to about 2 billion light years ;)
Some noteworthy points:
1. Each dot represents a *galaxy*
2. About 100K galaxies are shown. Parsing takes
a few minutes, but render is actually very fast.
3. The empty cones are a result of not being able to
observe through the disk of our own Galaxy
4. The outward thinning is caused by not observing
fainter galaxies at larger distancees.
5. The colors are not very scientific ;)
Post a reply to this message
Attachments:
Download 'universe.png' (451 KB)
Preview of image 'universe.png'
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Christian Froeschlin <chr### [at] chrfr de> wrote:
> The attached image uses data from the "6dF Galaxy Survey"
> at http://www.aao.gov.au/local/www/6df/ to visualize our
> closest neighbours up to about 2 billion light years ;)
>
> Some noteworthy points:
>
> 1. Each dot represents a *galaxy*
> 2. About 100K galaxies are shown. Parsing takes
> a few minutes, but render is actually very fast.
You know this deserves an animation, right? :)
even a simple rotation will do, please... :)
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I can see my house.
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nemesis wrote:
> You know this deserves an animation, right? :)
hmm ... maybe I'll give it a try someday ;)
But there are already fly-through videos on the site of the
survey itself, which you might find of interest:
http://www.aao.gov.au/local/www/6df/About/index.html
Look at the bottom of the page. In fact, some seem to be
done by P. Bourke who is no stranger to these newgroups ;)
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nemesis wrote:
> You know this deserves an animation, right? :)
>
> even a simple rotation will do, please... :)
Actually that would break so many laws of physics that it hurts.
For the whole group of galaxies to rotate in a short time (or,
alternatively, for the camera to go around them), the speeds involved
would make the speed of light be like the speed of continental drift to
a squirrel. Not to talk that even if they (or the camera) could move
that fast, the resulting image would be... interesting.
Of course you could argue that the animation represents a series of
still photos taken millions of years apart, ie. the video has been "sped
up" by a humongous amount. However, by the billions of years involved in
that process the galaxies would have probably changed locations rather
visibly.
(Yeah, I know, I'm nitpicking really badly here. ;) )
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4a025f03$1@news.povray.org...
>I can see my house.
>
ROTFL
Marc
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St. wrote:
> I can see my house.
>
In the Total Perspective Vortex? Where's Zaphod Beeblebrox? ;-)
-=- Larry -=-
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Larry Hudson <org### [at] yahoocom> wrote:
> St. wrote:
> > I can see my house.
> >
> In the Total Perspective Vortex? Where's Zaphod Beeblebrox? ;-)
Over there, eating the piece of cake that drives the whole thing... :-D
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Warp <war### [at] tagpovrayorg> wrote:
> nemesis wrote:
> > You know this deserves an animation, right? :)
> >
> > even a simple rotation will do, please... :)
>
> Actually that would break so many laws of physics that it hurts.
>
> For the whole group of galaxies to rotate in a short time (or,
> alternatively, for the camera to go around them), the speeds involved
> would make the speed of light be like the speed of continental drift to
> a squirrel. Not to talk that even if they (or the camera) could move
> that fast, the resulting image would be... interesting.
This is actually doable, theoretically, thanks to relativistic time dilation.
The challenges will be:
- A propulsion system to get to relativistic speed. It needs to be
long and slow (a year or so) to avoid squashing the equipment (and
astronauts?) with excessive G forces.
- Avoiding massive hull damage from slamming violently into stray
hydrogen atoms.
- Decoding the image. The entire universe will appear confined to a
brilliant speck of gamma radiation in the direction of travel, due
to extreme blue shift and abberation of light.
- Finding the way back home. In the three years aboard the space
craft, billions of years will have elapsed on Earth, during which:
- You will die (unless the space craft is manned, and you're
in it).
- The Sun will have made dozens of orbits around the galaxy.
Gravitational perturbations from dark matter and at least
100,000,000,000 other stars will make this a bear to
calculate.
- The Milky Way will have made at least one pass by the Great
Andromeda Galaxy (M31). Even if the two galaxies don't
merge, the Milky Way will be unrecognizable due to tidal
effects. No telling where old Sol will be; it may even be
ejected from the galaxy, or captured by M31.
- The Sun will have shrunk to a white dwarf.
- Prior to that, the Earth will have long been incinerated by
the Sun.
Bon Voyage!
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Attachments:
Download 'local_affairs.png' (6 KB)
Preview of image 'local_affairs.png'
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"Cousin Ricky" <ric### [at] yahoocom> wrote:
> Warp <war### [at] tagpovrayorg> wrote:
> > nemesis wrote:
> > > You know this deserves an animation, right? :)
> > >
> > > even a simple rotation will do, please... :)
> >
> > Actually that would break so many laws of physics that it hurts.
> >
> > For the whole group of galaxies to rotate in a short time (or,
> > alternatively, for the camera to go around them), the speeds involved
> > would make the speed of light be like the speed of continental drift to
> > a squirrel. Not to talk that even if they (or the camera) could move
> > that fast, the resulting image would be... interesting.
>
> This is actually doable, theoretically, thanks to relativistic time dilation.
> The challenges will be:
[snip challenges]
> Bon Voyage!
Poor fools. All you need to do is use your hyperdrive to circumnavigate the
universe, dropping out occasionally to take a photo, then return to earth in
time for a cup of tea before lunch.
;-)
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