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.

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User profile Profile [AF>EDLS>Physique] Pas93
Je m'appelle pascal, j'ai 16ans et j'habite en France plus precisement en Ile de france. Mes passes temps sont le foot, la musculation, et...


Scheduled downtime over
The power is back and so are we. Happy crunching! 15 Dec 2017, 13:55:46 UTC · Comment

Scheduled downtime
Dear all, due to a scheduled power outage at our hosting site, Cosmology@Home will be offline starting later today (Dec 13) and may remain down for as long as 48hrs. We apologize for any inconvenience. 13 Dec 2017, 10:01:15 UTC · Comment

Fill out a survey to help Cosmology@Home
Hi everyone, graduate student Lo Lee and Professor Peter Darch of the University of Illinois (where we got our start back in 2007) are conducting a survey of Cosmology@Home users for their research. If you have a moment, we'd appreciate if you could fill in the survey at Your (completely anonymous and confidential) responses may also help us guide the design of Cosmology@Home in the future. Many thanks! 16 Nov 2017, 17:26:37 UTC · Comment 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

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