Cosmology@Home lets you volunteer your spare computer time (like when your screen saver is on) to help search for the model which best describes our Universe and to find the range of models that agree with available cosmological and particle physics data.

conceptFEATURED CONCEPT: Dark Matter
Unlike ordinary matter, dark matter does not emit or absorb light--or any other type of electromagnetic radiation. Consequently, dark matter cannot be observed directly using a telescope or any other astronomical instrument that has been developed by humans. If dark matter has these strange properties, how do we know that it exists in the first place?
Like ordinary matter, dark matter interacts gravitationally with ordinary matter and radiation. Astronomers study the distribution of dark matter through observing its gravitational effects on ordinary matter in its vicinity and through its gravitational lensing effects on background radiation. The background image shows the bullet cluster, a famous example where the visible matter does not follow the mass distribution.
Combining all the available evidence, dark matter represents about 83% of the matter content of the universe. Read more about dark matter on this web page. Let us know your questions and comments on the message board.

User of the Day

User profile Profile melter65
Member of The UK BOINC Team. Join us here Join the UK BOINC Team: Visit the UK BOINC...


Server status
Hi guys, over the last several days the site has been suffering from what ultimately was a database error that caused several of the problems some of you have been posting / emailing about. Sorry for the slow response with the holidays here, but we should be fully back online at this point. Until everything is flushed out, there may be some workunits which will be screwed up as a result unfortunately. If you feel like you lost a significant amount of credit as a result of this, or if you notice anything still not working, please don't hesitate to PM me with more details. Happy crunching! 26 Nov 2016, 11:46:43 UTC · Comment

Some security and cosmetic upgades
We have added the option to access the C@H website more securely via "https", if you'd like to do so, you can update your bookmarks to use For now this remains purely optional (for example, if you don't know what https is, you can ignore this). At some point in the future, we will likely move to requiring this, but we'll give warning and post more details then.

Also, I've fixed a number of minor cosmic things about the site, most notably 1) the BBCode buttons when posting to the forums now work 2) a number of pages which were rendered too wide should now correctly fit the screen. If, as you're using the site, you find any other glitches, please don't hesitate to take a screenshot and post on the forums so we can fix things! Thanks all! (Edit: ha, oops meant to say *cosmetic* things above, although I'll leave in the somewhat appropriate typo)
22 Sep 2016, 15:19:08 UTC · Comment

Planck parameter sims paper out
In February we started running a new application. Today the paper making use of the results that thousands of you guys calculated is out! Look here in the coming weeks for more posts detailing exactly what we found. Until then, you can see the paper here. On behalf of the C@H team and of the Planck collaboration, thanks again everyone! 9 Aug 2016, 3:07:10 UTC · Comment

Planck/camb version 2.01
The two Docker-based apps have just been upgraded to 2.01, notably with 1) support for Virtualbox 5.1 and 2) Fixed the "Unknown option: --lpt1" on MAC causing some jobs to fail. 6 Jun 2016, 9:40:05 UTC · Comment

Docker-based applications upgrade
The camb_boinc2docker and planck_param_sims apps are getting an upgrade which should reduce even further the number of failed jobs. Read more about the upgrade in the comments. 31 May 2016, 11:48:40 UTC · Comment

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