Astronomy links

[Martin]

http://arxiv.org/abs/astro-ph/0601168

 

best estimates of things like the hubble parameter, dark energy density, baryon matter density, dark matter, and so on

 

new WMAP data might be coming out this month that could cause some of these numbers to be revised, but this is a clear concise summary of the current estimates with some intersecting bubble diagrams that communicate some of how they are arrived at

[Martin]

the WMAP data did come out this Thursday

here is one of the papers

 

Spergel et al

Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology

http://lambda.gsfc.nasa.gov/product/map/dr2/pub_papers/threeyear/parameters/wmap_3yr_param.pdf

[softdragonz]

Hi SFN...

 

There is this new website I made for astronomers and space enthusiasts....

 

the link is....

 

http://www.vit.ac.in/seds_vit/default.html

 

It has a full fledged discussion forum ..... a space article database..... among many others

[mooeypoo]

Great place to watch an explanation about String Theory and the expanding universe:

 

http://www.pbs.org/wgbh/nova/elegant/program.html

 

~moo

[S.Ingvar]

this thread can be for stashing links to webpages with good explanations of astronomy stuff.

Join in if you feel like it.

 

On this webpage you can find many "good explanations of astronomy stuff" as well as new insights about the whole physics.

 

http://www.theuniphysics.info

 

Ingvar, Sweden

[Martin]

Interactive black hole feature at Hubblesite

http://hubblesite.org/discoveries/black_holes/home.html

 

Several SFN people liked this. Discussion here:

http://www.scienceforums.net/forums/showthread.php?t=21714

[Martin]

we have been using Ned Wright's cosmology calculator here at SFN for over two years now.

it was one of the first things I posted about at beginning of this thread.

 

here is a writeup about the calculator

http://arxiv.org/abs/astro-ph/0609593

A Cosmology Calculator for the World Wide Web

Edward L. Wright (UCLA)

8 pages with 1 included figure. Cosmology calculator available at this http URL, light travel time converter at this http URL and the advanced cosmology calculator at this http URL

 

"A cosmology calculator that computes times and distances as a function of redshift for user-defined cosmological parameters is available on the World Wide Web. This note gives the formulae used by the cosmology calculator and discusses some of its implementation. A version of the calculator that allows one to specify the equation of state parameter w and w' and neutrino masses, and a version for converting the light travel times usually given in the popular press into redshifts are also available."

[Jacques]

It may interest some of you :

 

On Sunday, Nov. 19th, Earth will pass through a stream of debris from comet 55P/Tempel-Tuttle. The result: a shower of Leonid meteors.

 

"We expect an outburst of more than 100 Leonids per hour," says Bill Cooke, the head of NASA's Meteoroid Environment Office in Huntsville, AL.

http://science.nasa.gov/headlines/y2006/14nov_leonids.htm

[Martin]

http://www.uni.edu/morgans/ajjar/Cosmology/cosmos.html

[Fred56]

Found a pretty nice EMR chart (nowhere else to put it):

http://www.lot-oriel.com/site/site_down/cc_light_deen01.pdf

 

Just for good measure, what a Mr Fradkin thinks we should be looking for:

 

http://online.kitp.ucsb.edu/online/qubit_c06/fradkin/pdf/Fradkin1_KITP.pdf

[Martin]

Updating some basic cosmology links:

Ned Wright's cosmology tutorial

http://www.astro.ucla.edu/~wright/cosmolog.htm

 

Ned Wright's cosmology FAQ

http://www.astro.ucla.edu/~wright/cosmology_faq.html

 

Ned Wright's most basic cosmology calculator

http://www.astro.ucla.edu/~wright/CosmoCalc.html

(he has links to some more advanced or specialized calculators)

 

Morgan's calculator

http://www.uni.edu/morgans/ajjar/Cosmology/cosmos.html

 

Murphy's coordinate conversion tool

http://fuse.pha.jhu.edu/support/tools/eqtogal.html

 

Lineweaver and Davis' Scientific American article Misconceptions about the big bang March 2005.

AS LONG AS THIS PRINCETON LINK WORKS IT IS BETTER THAN THE OTHERS

 

http://www.astro.princeton.edu/~aes/AST105/Readings/misconceptionsBigBang.pdf

 

Here are the links to the same article at the SciAm website. But these links have been going dead or else the GRAPHICS that you used to get have been disappearing. So these SciAm links may not be as good as the Princeton one

 

http://www.sciam.com/article.cfm?chanID=sa006&colID=1&articleID=0009F0CA-C523-1213-852383414B7F0147

 

The Lineweaver Davis article had some very useful SIDEBARS giving pictorial diagrams with a question together with right and wrong answers explained. For easier access, here are links to individual sidebars.

 

http://www.sciam.com/media/inline/0009F0CA-C523-1213-852383414B7F0147_p39.gif

What kind of explosion was the big bang?

 

http://www.sciam.com/media/inline/0009F0CA-C523-1213-852383414B7F0147_p40.gif

Can galaxies recede faster than light?

 

http://www.sciam.com/media/inline/0009F0CA-C523-1213-852383414B7F0147_p42.gif

Can we see galaxies receding faster than light?

 

http://www.sciam.com/media/inline/0009F0CA-C523-1213-852383414B7F0147_p43.gif

Why is there a cosmic redshift?

 

http://www.sciam.com/media/inline/0009F0CA-C523-1213-852383414B7F0147_p44.gif

How large is the observable universe?

 

http://www.sciam.com/media/inline/0009F0CA-C523-1213-852383414B7F0147_p45.gif

Do objects inside the universe expand, too?

[Martin]

Some recent cosmology data and estimates:

Komatsu et al (WMAP 5th year data, cosmology implications)

http://arxiv.org/abs/0803.0547

 

They publish a lowerbound estimate for the radius of curvature of the universe--95 percent confidence level.

See Figure 2 on page 4 and convert the units to lightyears

( 23 *(1/0.72)*3.26 billion lightyears = 104 billion lightyears )

A 'best fit' estimate derived from Ned Wright's January paper was 130 billion lightyears, not far from their lower bound.

 

So space might have infinite volume but it also might very well have finite. And if it has finite volume then they are telling us the length of the longest possible straight line is AT LEAST 2 pi times 104 billion lightyears-----in other words about 650 billion LY.

 

That's the idea of giving a lower bound. The circumference has to be at least 650 billion LY. It could be more, and it could be infinite, but with 95% confidence it cannot be less. If you could travel at a billion times c, then you could start out from earth and travel in the straightest possible line for at least 650 years before getting back to square one.

[Martin]

Nobel laureate George Smoot on observational cosmology, early universe, microwave background...

General audience, charts, graphs, but no equations.

 

 

http://www.revver.com/video/827006/the-history-and-fate-of-the-universe-part-1-of-9/

 

http://www.revver.com/video/827106/the-history-and-fate-of-the-universe-part-2-of-9/

 

http://www.revver.com/video/827171/the-history-and-fate-of-the-universe-part-3-of-9/

 

http://www.revver.com/video/832550/the-history-and-fate-of-the-universe-part-4-of-9/

 

http://www.revver.com/video/832599/the-history-and-fate-of-the-universe-part-5-of-9/

 

http://www.revver.com/video/832643/the-history-and-fate-of-the-universe-part-6-of-9/

 

http://www.revver.com/video/832679/the-history-and-fate-of-the-universe-part-7-of-9/

 

http://www.revver.com/video/832724/the-history-and-fate-of-the-universe-part-8-of-9/

 

http://www.revver.com/video/832788/the-history-and-fate-of-the-universe-part-9-of-9/

[alex sam]

thank you for links

[zheng sheng ming]

it a good way! thanks!

[ExploreScience]

What a great list of resources.

 

I have been putting together a list of books, magazines, and news sources for people interested in astronomy and other fields in science and technology. The site is Explore-Science.net.

 

Great Astronomy Books is a growing list of the best reads in astronomy.

 

The Astronomy Magazines page presents the top picks for astronomy articles.

 

Finally, the Astronomy News section gathers the best sources on the web for astronomy discoveries and research.

[tika864]

thx so much this is very nice

[Klaynos]

!

Moderator Note

Summerwind's post about a new idea has been split and moved to speculations

http://www.scienceforums.net/topic/61312-summerwinds-no-dark-energy-proposal/

[the asinine cretin]

This is pretty awesome.

 

258 Astronomy Lectures from UC Berkeley

[maminsin21]

DOWNLOAD NATIONAL GEOGRAPHIC MAGAZINES FOR FREE!!!

http://adf.ly/AQ0K5

[Coty]

This is the sire were are needed specialists for Ecyclopedia about creation of the

world http://postanaksveta.blogspot.com/p/big-encyclopedia-of-world.html

Also has English & Serbian version, visit and enjoy!

[Paal Brekke]

Now since the Sun is very active and Space Weather is a hot topic. You may find this book interesting..comes with online multimedia material.

http://www.springer.com/astronomy/extraterrestrial+physics%2C+space+sciences/book/978-1-4614-0570-2?changeHeader

http://www.amazon.com/Our-Explosive-Sun-Visual-Source/dp/146140570X/ref=sr_1_1_title_0_main?s=books&ie=UTF8&qid=1312879357&sr=1-1

Cheers

Pål

----------

[Akram Fakir]

A lot of discussions I see. Thank you all the discussions. I will be back to you. Today I am not going to discuss something as this is my first day in the community. I want to visit on the forum and give you thank for the nice posts.

[proximity1]

Prof. Christopher Martin's "Space Astrophysics Laboratory", associated with Cal Tech. wtih, among its interesting links, this one: "GALEX", the Galaxy Evolution Explorer.

[krash661]

some might find this interesting or useful,

 

http://workshop.chromeexperiments.com/stars/

 

" If you're running on Chrome browser, check out Google's latest Experiment project - it visualizes the precise location of at least 100,000 stars in our Milky Way galaxy, using various imagery and data pulled from NASA and the European Space Agency (ESA). For your frame of reference, there are approximately 200 to 400 billion stars in the Milky Way galaxy. "

 

 

 

zoom in all the way to see the sun,zoom all the way out to see the galaxy.

or everything in between.

you can grab this with your mouse and move any axis's plane.

take the tour that's provided.