# Thread: To you calculator !!

1. today i saw in the news paper that we discovered a gigantic (and the word is weak) mass of gas that woudl be as old as the universe or so. it woudl have been there only 800 000 000 years after the big bang considering that the big bang occured about 327 000 000 000 years ago its incredibly old

this huge gas mass woudl be about 55 000 light years big and i wondered how much time it woudl take to walk threw this mass (even tho no human coudl do that lets just consider an immortal as nothing to do for the next 100 000 000 000 years :P)

here are the data's u need to complete this

mass size : 55 000 light years
light speed : c=299 792 458 km/s

for the ones who may not know (but i dont think there will be) a lght years is the distance travelled by light in a years

i await your awnser and commentary

(this is my first post btw :P)

2.

3. You're better off expressing things in millions and billions. Makes it easier to read. And your age of the universe estimate is off by a factor of about 20.

Let's say a person walks at 3 mph. That's approx. 1.5 meters per second. Light is 3x10^8 meters per second. So a person walks 5x10^-7 % the speed of light. So 55K light years / (5x10^-9) = 1.1x10^13 years to walk across the dust cloud.

Or 11000 billion years. 11 Trillion years. So a long time.

4. yea that sure is a long time

and yea i know my information arent the most accurate cuz i wrote them down back from what i remembered

5. Originally Posted by oblivion825
today i saw in the news paper that we discovered a gigantic (and the word is weak) mass of gas that woudl be as old as the universe or so. it woudl have been there only 800 000 000 years after the big bang considering that the big bang occured about 327 000 000 000 years ago its incredibly old

this huge gas mass woudl be about 55 000 light years big
First, the universe is thought to be 13.7 billion years old, i.e. years. This is very different from what you quote. I would also be interested in a few more details about that, e.g. what isits nature (cloud, gas, stars), where it was found, at what distance, its total mass. Who are the authors of the original publication?

6. Originally Posted by oblivion825
(this is my first post btw :P)
Welcome.

Ouchi, M. et al Discovery of a Giant Lya Emitter Near the Reionization Epoch http://arxiv.org/abs/0807.4174 2008, 2009

Abstract: We report the discovery of a giant Lya emitter (LAE) with a Spitzer/IRAC counterpart near the reionization epoch at z=6.595. The giant LAE is found from the extensive 1 deg^2 Subaru narrow-band survey for z=6.6 LAEs in the Subaru/XMM-Newton Deep Survey (SXDS) field, and subsequently identified by deep spectroscopy of Keck/DEIMOS and Magellan/IMACS. Among our 207 LAE candidates, this LAE is not only the brightest narrow-band object with L(Lya) = 3.9+/-0.2 x 10^43 erg/s in our survey volume of 10^6 Mpc^3, but also a spatially extended Lya nebula with the largest isophotal area whose major axis is at least ~3''. This object is more likely to be a large Lya nebula with a size of >~17 kpc than to be a strongly-lensed galaxy by a foreground object. Our Keck spectrum with medium-high spectral and spatial resolutions suggests that the velocity width is v(FWHM)=251+/-21 km/s, and that the line-center velocity changes by ~60 km/s in a 10-kpc range. The stellar mass and star-formation rate are estimated to be 0.9-5.0 x 10^10 Mo and >34 Mo/yr, respectively, from the combination of deep optical to infrared images of Subaru, UKIDSS-Ultra Deep Survey, and Spitzer/IRAC. Although the nature of this object is not yet clearly understood, this could be an important object for studying cooling clouds accreting onto a massive halo, or forming-massive galaxies with significant outflows contributing to cosmic reionization and metal enrichment of inter-galactic medium.

7. i saw that article in the ''devoir'' of april 24th 2009 its a montreal newspaper and that mass is made out of gas

if i remember correctly they named it himika or himiko

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