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== Objective ==
The main objective of CREDO is the detection and analysis of extended cosmic ray phenomena, so-called super-preshowers (SPS), using existing as well as new infrastructure (cosmic-ray observatories, educational detectors, single detectors etc.). The search for ensembles of cosmic ray events initiated by SPS is yet an untouched topic, in contrast to the current state-of-the-art analysis, which is focused on the detection of single cosmic ray events. Theoretical explanation of SPS could be given either within classical (e.g., photon-photon interaction) or exotic (e.g., Super Heavy Dark Matter decay or annihilation) scenarios, thus detection of SPS would provide a better understanding of particle physics, [[High-energy astronomy|high energy astrophysics]] and [[cosmology]]. The ensembles of cosmic rays can be classified based on the spatial and temporal extent of particles constituting the ensemble. Some classes of SPS are predicted to have huge spatial distribution, a unique signature detectable only with a facility of global size. Since development and commissioning of a completely new facility with such requirements is economically unwarranted and time-consuming, the global analysis goals are achievable when all types of existing detectors are merged into a worldwide network. The idea to use the instruments in operation is based on a novel trigger algorithm: in parallel to looking for neighbour surface detectors receiving the signal simultaneously, one should also look for spatially isolated stations clustered in a small time window. On the other hand, CREDO's strategy is also aimed at an active engagement of a large number of participants, who will contribute to the project by using common electronic devices (e.g. smartphones), capable of detecting cosmic rays. It will help not only in expanding the geographical spread of CREDO, but also in managing a large manpower necessary for a more efficient crowd-sourced pattern recognition scheme to identify and classify SPS. A worldwide network of cosmic-ray detectors could not only become a unique tool to study fundamental physics, it will also provide a number of other opportunities, including [[space weather]] or [[geophysics]] studies. Among the latter, one can list the potential to predict [[earthquakes]] by monitoring the rate of low energy cosmic-ray events. This diversity of potential applications has motivated the researchers to advertise the concept across the astroparticle physics community.<ref name="aasp"/><ref>{{cite web |url=https://icd.desy.de/e49245/ |title=Global Cosmic Ray Studies |website=DESY Deutsches Elektronen-Synchrotron |access-date=2018-03-22 |archive-date=2018-02-03 |archive-url=https://web.archive.org/web/20180203212718/https://icd.desy.de/e49245/ |url-status=dead }}</ref><ref>{{Cite web | url=http://www.intibs.pl/en/seminars/current-seminars/seminar/1002.html |title = Cosmic-Ray Extremely Distributed Observatory: New research possibilities in astroparticle physics | Seminar of the Institute of Theoretical Physics of University of Wrocław | INTiBS}}</ref><ref>{{cite web |url=http://www.oa.uj.edu.pl/2017czastki/homola.pdf
== Implementation ==
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* [http://credo.science Project page]
* [https://api.credo.science Detected events]
*[https://credo.science/credodetektor/ Polish board] {{Webarchive|url=https://web.archive.org/web/20180317035853/https://credo.science/credodetektor/ |date=2018-03-17 }}
* [https://credo.science/credodetector/ English board] {{Webarchive|url=https://web.archive.org/web/20180317035720/https://credo.science/credodetector/ |date=2018-03-17 }}
* [https://www.youtube.com/watch?v=6rHnW--PZQk&t=1s Video about CREDO]
* [https://credo.science/
== References ==
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