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 [BAT] Jack Raby
I'm member of, the biggest Belgian team. I live in Namur, a small town in the southern part of Belgium. I'm crunching since 1999.

News downtime explanation
Hi all. As you might have noticed, was unreachable for the last ~2.5 days. This was due to a failure properly reregistering our domain name after moving the server from one university to another earlier this year. In addition, as we couldn't contact you via the website, we tried to send out email notification of the issue, but due to a problem with the server software many of you did not receive this email. We'll work on addressing this so in the future it doesn't happen again. All should be back to normal now, although it may take as long as another 24 hours for the domain to fully propagate everywhere. We greatly apologize for this extended down time. 18 Aug 2017, 13:25:52 UTC · Comment domain temporarily down
Hi folks. Due to a mix-up related to having moved servers from one university to another earlier this year, we failed to properly renew the domain, which expired today. We are in the process of seeing what can be done to fix this. Until then, you can access the website at the temporary URL you are currently at,, and I will post the latest news on the situation here. We apologize for this downtime. 16 Aug 2017, 0:04:38 UTC · Comment

Planck contest results
The BOINC Pentathlon is complete, as is our own Planck contest! You can see the results of the Planck contest here and of the Pentathlon here. Congratulations to users Mumps[MM], UofS-Computer-Science, and Bryan, and to team SETI.USA (who also won the Pentathlon)! You guys will be added to the list of thank-yous in our paper.

In the end it was a quite exciting race for the 3rd place user spot, Bryan managed to overtake KaptainBlaZzed with only 45 minutes left in the contest last night! Well done to both of you and many thanks to all of the thousands of users and hundreds of teams that contributed. This was far and away the most computing power I've seen at C@H since I've been managing it, and the workunits you computed will greatly help us improve our work. Stay tuned for a future post about these results.
19 May 2017, 9:26:22 UTC · Comment

New camb_boinc2docker workunits temporarily disabled
Hi all, in an effort to keep the server functioning smoothly (its operating pretty close to capacity with all the extra traffic from the Pentathlon) I've disabled creation of new camb_boinc2docker jobs until the contest is over on May 19th. All your in-progress camb_boinc2docker work will finish and be validated, this only means no *new* work for this application will be sent out by the server. If you wish to continue crunching Virtualbox applications (like camb_boinc2docker was), there should be enough planck_param_sims jobs, just make sure you haven't explicitly disabled this application in your preferences. Good luck and happy crunching! 10 May 2017, 17:08:40 UTC · Comment

Planck contest standings
The in-progress standings of the Planck contest can now be seen here! (note: those standings include only Planck jobs, the Pentathlon counts any Cosmology@Home job).

Additionally, validation had been lagging a bit, but that is now fixed. It should take about 48 hours for all the jobs that had piled up waiting on validation to finish and for credit to be granted. There is also a shortage of work for the camb_boinc2docker and planck_param_sims applications, which I'm currently working on now and I expect to be fixed by tonight. Apologies for this!
7 May 2017, 14:35:04 UTC · Comment

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