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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Planck contest deadline announced
The contest to be thanked in our upcoming Planck paper will end on May 5 at 13:00 UTC. Good luck to everyone in the final two weeks! 21 Apr 2016, 13:46:37 UTC · Comment

Updates on Planck app and website
Thanks to you guys we've almost hit the 10,000 Planck parameter simulations we wanted to do. Read within what we've learned from these, where were going next, and about a few minor updates to C@H. 3 Apr 2016, 14:28:04 UTC · Comment

Server temporarily degraded
I'm working through figuring out why some uprgades didn't quite go as planned, the server may be a bit degraded the next few hours, including download errors and lack of new tasks. Hopefully should be sorted out soon. 31 Mar 2016, 17:23:50 UTC · Comment

New app is live
The new app is live! Read more about it in this post. The top three users and top team will be thanked in our paper, track stats here. Come help us figure out something new about our universe! 16 Feb 2016, 16:16:06 UTC · Comment

Some technical behind-the-scenes at C@H
For anyone interested in the inner workings of C@H, you might be interested in this 10 minute screen cast I just posted. Its pretty technical, but shows what running a server and running jobs kind of looks like from our end. And of course if anyone with technical expertise wants to contribute to C@H with your code, not just your CPU cycles, we welcome that too! (just get in contact with me) 14 Feb 2016, 18:43:46 UTC · Comment

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