Astronomers discover 90 per cent more universe

[Cochise]

Hey Miz they found it! >.>

By DAILY MAIL REPORTER
Last updated at 3:57 AM on 27th March 2010
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Astronomers know that many surveys of the universe miss a large proportion of their targets, but a new survey has found that 90 per cent of galaxies have gone undetected.
Traditional surveys use light emitted by hydrogen, known as the Lyman-alpha line, to probe the number of stars in the distant universe.
But the new survey found that Lyman-alpha light gets trapped within the galaxy that emits it and that 90 per cent of galaxies do not show up in Lyman-alpha surveys, according to Universe Today.

http://i.dailymail.co.uk/i/pix/2010/...46_468x303.jpg

Astronomers have found that found that 90 per cent of galaxies have previously gone undetected
'Astronomers always knew they were missing some fraction of the galaxies in Lyman-alpha surveys,' explains Matthew Hayes, the lead author of the paper, published this week in Nature.
'But for the first time we now have a measurement. The number of missed galaxies is substantial.'
Using the new HAWK-I camera attached to a telescope, Mr Hayes and his team surveyed an area of space previously measured in terms of Lyman-alpha light.
The new survey recorded light emitted at a different wavelength also by glowing hydrogen and known as the H-alpha line.

http://i.dailymail.co.uk/i/pix/2010/...47_468x299.jpg

The new HAWK-I camera (pictured) was used to survey an area of space previously measured in terms of Lyman-alpha light
They specifically looked at galaxies whose light has been travelling for 10 billion years.
'This is the first time we have observed a patch of the sky so deeply in light coming from hydrogen at these two very specific wavelengths, and this proved crucial,' said team member Goran Ostlin.
The astronomers concluded that traditional surveys carried out using Lyman-alpha only see a tiny part of the total light that is produced, since most of the Lyman-alpha photons are destroyed by interaction with the interstellar clouds of gas and dust.
As a result, as much as 90 per cent of galaxies go unseen in these surveys.
'If there are ten galaxies seen, there could be a hundred there,' Mr Hayes said.
'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,' said co-author Miguel Mas-Hesse.



Read more: http://www.dailymail.co.uk/sciencete...#ixzz0jNNU14gn

[Woozie]

Like I said, our universe is getting larger every day. I still think we should go back to the days where it was just Earth in the center. Things were much simpler back then.

And while we're at it, let's make the world be made of 4 elements again. Much more simple than a huge periodic table.

[Weiing]

for the nerdy part of me: this is awesome!

[Dimmauk]

Like I said, our universe is getting larger every day. I still think we should go back to the days where it was just Earth in the center. Things were much simpler back then.

And while we're at it, let's make the world be made of 4 elements again. Much more simple than a huge periodic table.

Can we have a 5th element? maybe heart or Leeloo?

[Kobus]

Can we have a 5th element? maybe heart or Leeloo?

awesome

[Gokulo]

I'm all for Leeloo.

[Conformity]

I think heart is also a requried element to get captain planet in this bitch

[bigrougabagel]

This may be me as an idiot, but does this mean we can give the "dark matter" theory a swift kick in the ass? Or have they always known they couldn't see these galaxies and we're still 90% short on matter to make gravitational models work?

[Maguspk]

Does this explain dark matter the gravity we saw but didn't know where it was coming from or is the relative distance between galaxies usually large enough that we don't really notice the effects gravity has on things around them?

[Woozie]

This may be me as an idiot, but does this mean we can give the "dark matter" theory a swift kick in the ass? Or have they always known they couldn't see these galaxies and we're still 90% short on matter to make gravitational models work?

Does this explain dark matter the gravity we saw but didn't know where it was coming from or is the relative distance between galaxies usually large enough that we don't really notice the effects gravity has on things around them?

The bolded part is more accurate.

What this article is saying is that when we look up into the sky with our telescopes, we miss 90% of the galaxies out there.

This doesn't address the dark matter problem. Here is an overly simplified version of the dark matter problem:

"When we look at any individual galaxy (including the milky way), it acts as if it is 10 times heavier than it looks. This can only be explained if the 90% of the matter is invisible, and hence we're only seeing one-tenth of it (either that or we need to change GR)"

So no, this discovery doesn't solve or even address the problem that dark matter is meant to solve. This is just saying there are more galaxies. Each of these individual galaxies will still have the same problem (i.e. they'll all act as if they are 10 times heavier than they appear).

[Maguspk]

Ah so dark matter deals directly wit shit acting more massive than we observe it to be. I see, thanks for the information. Still interesting to know there is so much out there. If only light wasn't so slow.

[Dimmauk]

I think heart is also a requried element to get captain planet in this bitch

that is why I suggested heart.

[brisk]

Does this relate to our galaxy's zone of avoidance? I remember from the LHC thread that it blocks us from seeing the rest of the unmapped areas.

[Max™]

It isn't just the ZoA, that portion of the Universe is difficult to see directly, but we can account for it with simple extrapolation.

Dark Matter or modified GR is needed because galaxies spin like solid objects, when the outer portions should rotate at a different speed than the inner ones.

It's also required to explain this shit:

http://astrofacts.files.wordpress.co...arkmatter2.jpg

Spoiler: show

http://vintageprintable.com/wordpres...ark-matter.jpg

*bigz pic*

http://startswithabang.com/wp-conten..._lens-full.jpg

http://dsc.discovery.com/space/top-1...er-625x450.jpg


This article is about an issue in the way we normally count galaxies, which depends on a specific spectral line of hydrogen, that Lyman-Alpha shit, that they recently discovered can get trapped inside of galaxies, skewing the results of surveys dramatically.

[Tricen]

Is it like Einstiens ring or whatever?

[Norellicus]

That last pic is trippy...stare at it for a few minutes and you start to kind of get sucked in

[Max™]

http://burro.cwru.edu/Academics/Astr...steinCross.jpg

Einstein's Cross, different thing but it can be caused by dark matter.

[Kaylia]

Does this explain dark matter the gravity we saw but didn't know where it was coming from or is the relative distance between galaxies usually large enough that we don't really notice the effects gravity has on things around them?

Nah, dark energy and dark matter is mostly a question of density, not total quantity.

Dark matter is invisible matter (invisible because it doesn't interact react with light) that make galaxy move like there was a lot more mass around than what we can see.

Dark energy is the vacuum energy or the energy associated with empty space . It's why virtual particles can exists and why the universe is in expansion.



[edit]

About Dark matter, why is there none in solar system if it only interact with gravitational force? It should attract some and behave like our galaxy, no?

[Draylo]

I just don't find this interesting anymore. Seems like they keep talking about the same shit, if they find some aliens let me know.

[Colenzo]

fuck you stupid ass scientologists