Assertion: cosmic ray's discovery | /r/CreatedBy | team
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text: The discovery was made by a team led by astrophysicist Sladjana Knežević of the Weizmann Institute of Science in Israel, using as instrument known as GHaFaS, mounted on the 4.2m William Herschel Telescope at the Roque de los Muchachos Observatory in the Canary Islands.