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Earth's insignificance increases https://gladerebooted.net/viewtopic.php?f=2&t=2364 |
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Author: | Lydiaa [ Wed Mar 24, 2010 6:17 pm ] |
Post subject: | Earth's insignificance increases |
Quote: Astronomers may have underestimated the tally of galaxies in some parts of the universe by as much as 90 percent, according to a study reported on Wednesday in Nature, the weekly British science journal. Surveys of the cosmos are based on a signature of ultraviolet light that turns out to be a poor indicator of what's out there, its authors say. In the case of very distant, old galaxies, the telltale light may not reach earth as it is blocked by interstellar clouds of dust and gas — and, as a result, these galaxies are missed by the map-makers. "Astronomers always knew they were missing some fraction of the galaxies... but for the first time we now have a measurement. The number of missed galaxies is substantial," said Matthew Hayes of the University of Geneva's observatory, who led the investigation. Hayes' team used the world's most advanced optical instrument — Europe's Very Large Telescope (VLT) in Chile, which has four 8.2m behemoths — to carry out the experiment. They turned two of the giants towards a well-studied area of deep space called the GOODS-South field. The astronomers carried out two sets of observations in the same region, hunting for light emitted by galaxies born 10 billion years ago. The first looked for so-called Lyman-alpha light, the classic telltale used to compile cosmic maps, named after its US discoverer, Theodore Lyman. Lyman-alpha is energy released by excited hydrogen atoms. The second observation used a special camera called HAWK-1 to look for a signature emitted at a different wavelength, also by glowing hydrogen, which is known as the hydrogen-alpha (or H-alpha) line. The second sweep yielded a whole bagful of light sources that had not been spotted using the Lyman-alpha technique. They include some of the faintest galaxies ever found, forged at a time when the Universe was just a child. The astronomers conclude that Lyman-alpha surveys may only spot just a tiny number of the total light emitted from far galaxies. Astonishingly, as many as 90 percent of such distant galaxies may go unseen in these exercises. "If there are 10 galaxies seen, there could be a hundred there," said Hayes. The discovery could add powerfully to knowledge about the timeline by which stars and then galaxies formed. "Now that we know how much light we've been missing, we can start to create far more accurate representations of the cosmos, understanding better how quickly stars have formed at different times in the life of the Universe," co-author Miguel Mas-Hesse said in a press release issued by the European Southern Observatory (ESO). Only a small part of the light spectrum is visible to the human eye, which is why astronomers use ultraviolet, gamma and other radiation sources as additional sources for observation. I giggled at this "Very Large Telescope (VLT)" I guess scientists aint very good at naming stuff hehe |
Author: | Rodahn [ Wed Mar 24, 2010 6:23 pm ] |
Post subject: | |
Not surprising in the slightest. Space is a gigantic place, and our eyes (both natural and electronic) can only see so far. /queue Monty Python's Galaxy Song |
Author: | Raltar [ Wed Mar 24, 2010 6:38 pm ] |
Post subject: | |
All this tells me if that there is even more of a chance for intelligent life out there. There is no **** way our planet is the only cosmic mistake out there. There has to be something else out there. |
Author: | Xerxes [ Wed Mar 24, 2010 8:01 pm ] |
Post subject: | Re: Earth's insignificance increases |
Far out in the uncharted backwaters of the unfashionable end of the Western Spiral arm of the Galaxy lies a small unregarded yellow sun. Orbiting this at a distance of roughly ninety-eight million miles is an utterly insignificant little blue-green planet whose ape-descended life forms are so amazingly primitive that they still think digital watches are a pretty neat idea. A bit dated, but still makes it's case nonetheless....... |
Author: | Rafael [ Wed Mar 24, 2010 8:54 pm ] |
Post subject: | Re: |
Raltar wrote: All this tells me if that there is even more of a chance for intelligent life out there. There is no **** way our planet is the only cosmic mistake out there. There has to be something else out there. The cosmic dice don't recognize a snake eyes roll as being any more improbable or significant than any other combination. |
Author: | Diamondeye [ Thu Mar 25, 2010 7:35 am ] |
Post subject: | Re: Earth's insignificance increases |
Does this mean that estimates of the amount of mass and energy in the universe have been woefully low? |
Author: | Hokanu [ Thu Mar 25, 2010 9:34 am ] |
Post subject: | |
Read a quote that resonated with me the other day: "We are either the smartest beings in the universe or we are not. Either is a terrifying thought." Can't remember where I read it now. |
Author: | Diamondeye [ Thu Mar 25, 2010 9:54 am ] |
Post subject: | Re: |
Hokanu wrote: Read a quote that resonated with me the other day: "We are either the smartest beings in the universe or we are not. Either is a terrifying thought." Can't remember where I read it now. You read it in Hopwin's signature. |
Author: | Hopwin [ Thu Mar 25, 2010 10:13 am ] |
Post subject: | Re: |
Hokanu wrote: Read a quote that resonated with me the other day: "We are either the smartest beings in the universe or we are not. Either is a terrifying thought." Can't remember where I read it now. Huh? |
Author: | Kaffis Mark V [ Thu Mar 25, 2010 10:55 am ] |
Post subject: | Re: Re: |
Rafael wrote: Raltar wrote: All this tells me if that there is even more of a chance for intelligent life out there. There is no **** way our planet is the only cosmic mistake out there. There has to be something else out there. The cosmic dice don't recognize a snake eyes roll as being any more improbable or significant than any other combination. Wouldn't that be permutation? |
Author: | Hokanu [ Thu Mar 25, 2010 11:33 am ] |
Post subject: | Re: Re: |
Hopwin wrote: Hokanu wrote: Read a quote that resonated with me the other day: "We are either the smartest beings in the universe or we are not. Either is a terrifying thought." Can't remember where I read it now. Huh? LOL well see there you go. |
Author: | Stathol [ Thu Mar 25, 2010 12:13 pm ] |
Post subject: | |
The title reminds me of this (very) short story by Terry Bisson: Spoiler: Lydiaa wrote: I giggled at this "Very Large Telescope (VLT)" I guess scientists aint very good at naming stuff hehe They're really not. For instance: Extremely Low Frequency Super Low Frequency Ultra Low Frequency Very Low Frequency Low Frequency Medium Frequency High Frequency Very High Frequency Ultra High Frequency Super High Frequency Extremely High Frequency New and Improved 2x Ultra High Frequency with Static Guard |
Author: | Müs [ Thu Mar 25, 2010 12:22 pm ] |
Post subject: | |
I would have put ultra above super. But that's just me. |
Author: | Kaffis Mark V [ Fri Mar 26, 2010 9:29 am ] |
Post subject: | Re: |
Müs wrote: I would have put ultra above super. But that's just me. But super means "above". How do you get above above, without being extreme? |
Author: | Jeryn [ Fri Mar 26, 2010 9:38 am ] |
Post subject: | Re: |
Stathol wrote: Lydiaa wrote: I giggled at this "Very Large Telescope (VLT)" I guess scientists aint very good at naming stuff hehe They're really not. For instance: Extremely Low Frequency Super Low Frequency Ultra Low Frequency Very Low Frequency Low Frequency Medium Frequency High Frequency Very High Frequency Ultra High Frequency Super High Frequency Extremely High Frequency New and Improved 2x Ultra High Frequency with Static Guard |
Author: | Stathol [ Fri Mar 26, 2010 1:40 pm ] |
Post subject: | |
And who can forget the Large Hard-on Collider? |
Author: | Kaffis Mark V [ Fri Mar 26, 2010 1:45 pm ] |
Post subject: | Re: |
Stathol wrote: And who can forget the Large Hard-on Collider? Sounds gay. And quite possibly painful. |
Author: | Taskiss [ Fri Mar 26, 2010 2:07 pm ] |
Post subject: | Re: Re: |
Kaffis Mark V wrote: Stathol wrote: And who can forget the Large Hard-on Collider? Sounds gay. And quite possibly painful. "Use the schwartz!" |
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