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Domain: roe.ac.uk

Stories and comments across the archive that link to roe.ac.uk.

Comments · 6

  1. Doughnut Stars by Anonymous Coward · · Score: 1, Interesting · on 150 Gigapixel Sky Image Contains 1 Billion Stars

    Why do some of the stars look like they've got holes in them?
    http://djer.roe.ac.uk/fcgi-bin/iipsrv.fcgi?FIF=/data/vsa/vvv/v5.tif&CNT=1&SDS=0,90&JTL=11,86696

  2. Re:That's Big! by SureshotM6 · · Score: 5, Interesting · on 150 Gigapixel Sky Image Contains 1 Billion Stars

    The source is a 91.6GB TIFF file. The filename on the server is in some of the CGI requests.

    -> curl -I http://djer.roe.ac.uk/vsa/vvv/v5.tif
    HTTP/1.1 200 OK
    Date: Wed, 04 Apr 2012 15:42:27 GMT
    Server: Apache/2.2.21 (Debian)
    Last-Modified: Sat, 24 Mar 2012 16:13:29 GMT
    ETag: "f61e88-16e808414a-4bbff6bf3ed80"
    Accept-Ranges: bytes
    Content-Type: image/tiff
    Content-Length: 98382135626
    Proxy-Connection: Keep-Alive
    Connection: Keep-Alive

  3. Compulsory picture by janwedekind · · Score: 4, Funny · on Russian Stealth Fighter Makes Its First Flight

    Stealth fighters can be detected by the characteristic pattern of reduced precipitation below the body of the aircraft:
    http://www.roe.ac.uk/~jkd/stealth.jpg

  4. Sombrero Galaxies and You by eldavojohn · · Score: 5, Interesting · on Galaxies Floating on a Dark Matter Stream
    These are called Sombrero Galaxies. I believe M 104 is the most famous since it was first noticed on May 11th, 1781.

    Does dark matter hold our universe together in a web? Perhaps, though this would mean that there is no such thing as truly empty space as a small amount of dark matter would have to exist. Perhaps what lays beneath the edges of our universe is nothing in the sense of it being devoid of dark matter?

    Check this out:
    Consider this fact: In the air we breathe, each cubic centimeter contains roughly 5 X 1019 atoms. In contrast, the intergalactic medium has a density of only 10-6 particles per cubic centimeter--each atom inhabits a private box a meter on each side. This would seem to suggest that there is not much matter in the intergalactic medium. But, given the enormous volume between the galaxies, it quickly adds up: The combined atomic mass of intergalactic gas exceeds the combined atomic mass of all the stars and galaxies in the universe--possibly by as much as 50 percent! There is indeed something in empty space
    From this article.

    While this article only mentions computer simulations, many scientific groups have gone along further researching, convinced that the cosmic web does exist. Some people have based most of their work on dark matter and the cosmic web though I believe it is still speculation and has yet to be accepted by the science community as a whole. I've read some crazy stuff about dark matter, like how it might be the "gravity particle" that is attracted to matter uniformly and causes the gravitational pull between objects. And even crazier books suggesting that the only way we'll ever be able to communicate between parallel existences is by lowering and raising these gravity particles.

    Now, the slashdot community seems to be fairly educated and extremely opinionated so how about it--does dark matter exist? If so, since it is very difficult to detect, what are its defining properties?
  5. It's in postscript, so be warned! by jd · · Score: 3, Informative · on New Uranus Moons and Rings Discovered
    The reference discusses systems in general, but does include a brief section on the Earth's rings. The text of interest is at the start of page 4. Ignoring the stuff about the IRAS and COBE satellites, which imaged it, we have the following comment:


    The Earth's ring corresponds to Case I in Figure 1, a circular ring with a gap at the location of the planet. However, the Earth's low mass means that it traps relatively few particles; the ring represents a density enhancement of only a few percent. This effect would scarcely appear in an image of the solar system seen from afar.

  6. Re:Astronomers went digital ages ago. by Anonymous Coward · · Score: 0 · on Would Ansel Adams Have Gone Digital?
    But there are still some uses for film: check this out. Though I suspect this'll be the last survey to use film.

    Cheers,

    another ex-MRAO person